A website says Philadelphia's police commissioner has asked federal authorities to take a look at the police department's use of deadly force.
Commissioner Charles Ramsey told Philly.com that he sought the review due to the rising number of police-involved shootings.
Philadelphia police shot 52 suspects last year, killing 15 of them. In 2011 police wounded or killed 35 people.
Officers shot and killed a man Saturday, the fourth police-involved shooting in as many days and the third resulting in a suspect's death.
Ramsey said the number of shootings "gets people wondering if they were all justified.''
He said police had been looking at the issue since December and the Civil Rights Division of the Department of Justice "agrees this is a good course of action.''
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Just in the past couple of weeks there have been a series of police-involved shootings in the city including police shooting a man with a knife and two men who investigators say had guns.