Perry L. Scott, Sr. and other individuals (collectively, “the plaintiffs”) brought this action on behalf of the deceased Phillip Scott (“Mr. Scott”) in Illinois state court. *754 They claimed that Officer Rodney Edin-burg (“Officer Edinburg”) impermissibly had used deadly force in attempting to arrest Mr. Scott. The defendants, Officer Edinburg and his employer, the Village of Glenwood, removed the case to federal court. The plaintiffs’ third amended complaint alleged a violation of 42 U.S.C. § 1983 based on an allegation of an illegal seizure in violation of the Fourth Amendment. The complaint also included an Illinois state survival action and wrongful death claim. 1 Having determined that Officer Edinburg’s use of deadly force was objectively reasonable, the district court granted the defendants’ motion for summary judgment. For the reasons set forth in this opinion, we affirm the judgment of the district court.
I
BACKGROUND
A. Facts
Rodney Edinburg was a police officer employed by the Village of Glenwood. At 11:10 p.m. on May 17, 1999, Officer Edinburg was off-duty and driving his personal car, a red convertible Ford Mustang. He parked the vehicle, with the top down, in a Marathon gas station on the South Side of Chicago, left the keys in the ignition, exited the car in search of something to eat, and approached J.J.’s hot dog stand adjacent to the gas station. While at the hot dog stand, Officer Edinburg learned that an individual had entered his car and was trying to steal it. The perpetrator was Phillip Scott. Officer Edinburg ran back to the car and stopped between three to five feet from the rear bumper. Officer Edinburg testified that he could not see Mr. Scott’s right hand, which was either searching for something or perhaps turning the ignition.
Officer Edinburg yelled “stop, stop,” “hey,” and “that’s my car.” R.63, Ex.3 at 22. The car’s reverse lights then came on, and it backed up toward him, so that Officer Edinburg was forced to run backward to avoid being hit. Mr. Scott was looking over his shoulder at Officer Edinburg as the vehicle backed up. As he moved out of the way, Officer Edinburg yelled “stop, police” and drew his revolver. Id. at 23-24. Two to four seconds later, the car stopped backing up and began to drive forward. The exact instant that the first shot was fired is unclear, but the parties agree that Officer Edinburg fired the shot no earlier than the instant when the car stopped moving backward and started to move forward. Officer Edinburg testified that, after the first shot was fired, the tires skidded and the car sped off.
Officer Edinburg stated that he noticed two individuals in the direct path of the car and that people were moving, ducking and running away as Mr. Scott drove through the parking lot at a very high rate of speed. The plaintiffs, however, introduced affidavits by two bystanders, stating that no one was in the car’s direct path and that no one was forced to move out of the way. It is undisputed that there were between twelve and fourteen patrons in the gas station parking lot throughout the incident. While the car was still in the parking lot, Officer Edinburg fired a second shot. The vehicle then exited the parking lot, proceeding north on State *755 Street. Officer Edinburg followed on foot and fired at least six more shots. Shortly thereafter, Mr. Scott died, and the car crashed. It is not clear which gunshot lolled Mr. Scott; but, the parties agree that the fatal shot was one of the “first few shots fired by Officer Edinburg, while he was on the gas station property.” R.58, Ex.C at 2; see Appellant’s Br. at 3-4.
B. District Court Proceedings
Relying on the testimony that Mr. Scott tried to run Officer Edinburg down with the Mustang and the uncontradicted testimony that there were twelve to fourteen bystanders in the gas station parking lot, the district court concluded that the use of deadly force was justified under
Tennessee v. Garner,
II
DISCUSSION
A. Standard of Review
We review the district court’s grant of the motion for summary judgment de novo.
See Adams v. Wal-Mart Stores, Inc.,
B. Fourth Amendment Analysis
The plaintiffs’ § 1983 claim is based on an alleged violation of Mr. Scott’s Fourth Amendment right to be free from unreasonable seizures. A police officer’s use of deadly force constitutes a seizure within the meaning of the Fourth Amendment, and therefore it must be reasonable.
See Tennessee v. Garner,
Where the officer has probable cause to believe that the suspect poses a threat of serious physical harm, either to the officer or to others, it is not constitutionally unreasonable to prevent escape by using deadly force. Thus, if the suspect threatens the officer with a weapon or there is probable cause to believe that he has committed a crime involving the infliction or threatened infliction of serious physical harm, deadly force may be used if necessary to prevent escape, and if, where feasible, some warning has been given.
Garner,
The issue of whether an intentional use of deadly force by a police officer is permissible under the Fourth Amendment requires an objective reasonableness inquiry.
See Graham v. Connor,
Officer Edinburg presents two rationales to justify his use of deadly force. 3 First, he contends that Mr. Scott committed a forcible felony by trying to run over him with the Mustang, a deadly weapon, which made it reasonable for him to protect himself by using deadly force. Second, Officer Edinburg argues that it was objectively reasonable to use deadly force *757 to protect the other patrons in the gas station parking lot. Assuming that either of these two propositions is true, then the use of deadly force would have been permissible under Tennessee v. Garner.
1. Threat to Officer Edinburg
Officer Edinburg contends that Mr. Scott threatened him with a deadly weapon by trying to back over him with the Mustang. He submits that this action justified his use of deadly force to protect himself. The plaintiffs argue, however, that there is a genuine issue of material fact concerning this matter that precludes summary judgment. We agree.
It is clear that, when an individual threatens a police officer with a deadly weapon, the officer is permitted to use deadly force in self-defense if the use is consistent with the principles set forth in
Tennessee v. Gamer. See Garner,
In their response to the defendants’ Local Rule 56.1 Statement of Uncontested Facts, the plaintiffs agreed with the defendants that “at the point where the vehicle stopped moving towards Defendant Edin-burg and began moving away from Edin-burg, he fired his weapon at Scott.” R.63 at ¶ 16; R.58 at ¶ 16. However, in his deposition testimony, Officer Edinburg initially stated that the car was in the process of backing up and stopping when he fired the first shot. See R.63, Ex.3 at 26 (“The brake lights came on after I backed up, yelled stop police at which time I fired a shot.”). On the next page, Officer Edin-burg was asked if the car had stopped when he fired the first shot, and he responded “no.” See R.63, Ex.3 at 27. Four pages later, the following exchange occurred: “Q. At the time you fired the first shot, was the vehicle backing up, standing still or moving away from you? A. Moving away from me.” R.65, Ex.C at 31. The discrepancy in Officer Edinburg’s testimony is significant.
If the fatal shot was fired while Mr. Scott was driving away, then the argument that Officer Edinburg was compelled to *758 fire in order to protect himself would be significantly weakened. Accordingly, there is a genuine issue of material fact as to the timing of the first shot, which precludes a grant of summary judgment based on Garner’s justification for self-defense.
2. Threat to Bystanders
Officer Edinburg also maintains that his use of deadly force did not violate the Fourth Amendment because, as Mr. Scott drove through the parking lot of the Marathon gas station, there were between twelve to fourteen patrons in the vicinity of the vehicle’s path whose safety Officer Edinburg believed was at risk; these people were “forced to run and duck out of the path of the vehicle.” R.58 at ¶¶ 7-18. Although we have determined that a genuine issue of material fact exists as to the timing of Officer Edinburg’s firing of the first shot, Mr. Scott’s attempt to run over Officer Edinburg is relevant in considering the reasonableness of Officer Edinburg’s perception that the bystanders were in danger. In
Ellis,
we explained “[i]f Ellis had threatened the officer with a weapon and then run off with the weapon, a reasonable officer ... could believe that Ellis created a danger to the community.”
Ellis,
The plaintiffs contend that the district court’s grant of summary judgment was inappropriate because there exists a genuine issue of material fact regarding whether there was a threat to any bystanders. They rely on the identically worded affidavits of eyewitnesses Moses Dean, Jr. and Gregory Woolridge for the proposition that no one was actually in the direct path of Mr. Scott as he drove through the parking lot and that no bystander was forced to flee the car. The affidavits state: “While the vehicle proceeded through the Marathon gas station parking lot, at no time *759 were there any people in the direct path of the vehicle’s travel.” R.63, Ex.5 at ¶ 7; R.63, Ex.6 at ¶ 7. They also state, “While the vehicle proceeded through the Marathon gas station parking lot, no people ran or were forced to flee from the vehicle’s path to avoid being struck by the car.” R.63, Ex.5 at ¶ 9; R.63, Ex.6 at ¶ 9. Finally, the plaintiffs invite us to consider statements in the affidavits from Dean and Woolridge that assert, “While the vehicle proceeded through the Marathon gas station parking lot, at no time were there any people who were in danger of being struck by the vehicle.” R.63, Ex.5 at ¶ 8; R.63, Ex.6 at ¶ 8. 6
The affidavits clearly create a disputed fact as to whether people were in the direct path of the car and whether they were forced to run and duck out of its way. Nevertheless, this conflict does not preclude summary judgment because the threatened individuals need not have been placed in the direct path of the threat. Deadly force may be exercised if the suspect’s actions place the officer, “his partner, or those in the
immediate vicinity
in imminent danger of death or serious bodily injury.”
Muhammed,
Additionally, the plaintiffs argue that the report of their expert, James Marsh, creates a genuine issue of material fact. The report concludes that Officer Edinburg’s actions were “based on faulty perception, poor judgment, were untimely, were without verbal warning, were excessive, and were unjustified.” R.63, Ex.7 at 11. However, Marsh’s report was introduced into the record without any supporting affidavit verifying its authenticity and is therefore inadmissible and cannot be considered for purposes of summary judgment.
See Haywood v. Lucent Techs., Inc.,
Moreover, even if the report were admissible, it would not create a genuine issue of material fact. The report’s analysis of Officer Edinburg’s use of deadly force concludes that he should have used the least amount of force possible under the circumstances if there were lesser alternatives available to secure the same result.
See
R.63, Ex.7 at 8. We have rejected that position and stated, “[w]e do not believe that the Fourth Amendment requires the use of the least or even a less deadly alternative so long as the use of deadly force is reasonable under
Tennessee v. Garner
and
Graham v. Connor
.... ”
Plakas v. Drinski,
“Fourth Amendment does not require police to exhaust every alternative before using deadly force”).
Finally, Mr. Scott argues that the testimony of William Cranston, one of Officer Edinburg’s instructors, precludes summary judgment. Cranston testified that shooting into a moving vehicle and the use of deadly force against a non-dangerous fleeing felon is a violation of police procedures.
See
R.65 at ¶¶ 4-6. However, 42 U.S.C. § 1983 protects plaintiffs from constitutional violations, not violations of state laws or, in this case, departmental regulations and police practices.
See Pasiewicz v. Lake County Forest Preserve Dist.,
The only issue before us is whether Officer Edinburg’s use of force to effect an arrest was a reasonable seizure consistent with the Fourth Amendment. We emphasize that we are not called upon to deter
*761
mine whether Officer Edinburg’s conduct was either good police practice or a violation of Illinois law.
See Bell,
Conclusion
The judgment of the district court is affirmed.
Affirmed
Notes
. The district court granted the defendants' motion for summary judgment, which sought summary judgment on both the § 1983 and pendent state law claims. See R.57 at 14. In this court, the plaintiffs have not argued either in their initial or reply brief that the grant of summary judgment on the state claims should be reversed. Consequently, we address the only issue asserted on appeal: whether summary judgment on the § 1983 claim was appropriate.
. We have held that, if the suspect threatens the officer with a weapon, the risk of serious physical harm to the officer or others has been established.
See Bell
v.
Irwin,
. The defendants argue in the alternative that Officer Edinburg is entitled to qualified immunity and that we may affirm on this ground although it was not relied on by the district court. Nevertheless, in this case, we need not consider the second prong of the
Saucier v. Katz,
. We note that Officer Edinburg fired approximately six additional shots after Mr. Scott had exited the gas station parking lot and was driving north on State Street. See R.65, Ex.C at 41. Nevertheless, the propriety of these shots is not in issue because the parties do not dispute that the gunshot that killed Mr. Scott was one of the "first few shots fired by Officer Edinburg, while he was on the gas station property.” R.58, Ex.C at 2; see Appellant’s Br. at 3-4 (agreeing that "it is believed that the first or second shot ... was ultimately responsible for [Mr. Scott's] death ... ”).
. Under Illinois law, Mr. Scott’s action of trying to steal Officer Edinburg’s Mustang constitutes the forcible felony of burglary.
See
720 ILCS 5/19-1;
People v. Buckner,
. Officer Edinburg contends that the statements in paragraph 8 are not admissible and therefore do not preclude summary judgment. In
Reese v. Anderson,
The second sentence quoted is not factual at all. It is simply an opinion — indeed, an opinion on the ultimate issue in this case. As such, it is a textbook example of conclu-soriness. What is needed in an affidavit of this sort are facts, reasons, observations, and explanations — in a word, evidence — not sweeping conclusions. Instead [the plaintiff] has given us what amounts to merely a general denial. Such may suffice in the courts of Carroll’s Wonderland, but our rules are more exacting.
See id. (emphasis in original) (citations omitted). Paragraph 8 of Dean’s and Woolridge's affidavits presents a similar conclusion on an ultimate issue that is not well supported by facts in the affidavit, such as the positions of other bystanders, their own positions, or the speed and path of the vehicle. Therefore, this portion of the affidavits cannot be used to create an issue of material fact.
.
See Smith v. City of Chicago,
