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 Pittsburgh (CNN) Protesters angry over the death of an unarmed teen who was shot by police this week marched Friday for the third straight night down the streets of downtown Pittsburgh. 
 
 Four people were arrested as hundreds of demonstrators blocked streets, Allegheny County Police Superintendent Coleman McDonough said. 
 
 Police are looking for a black sedan that drove through the crowd late Friday, said Chris Togneri, the city spokesman. No injuries were reported, he said. 
 
 Protesters were near PNC Park, where fans were leaving a Pittsburgh Pirates baseball game, when the car drove through, CNN affiliate KDKA reported 
 
 'How do you justify that?' 
 
 Antwon Rose , 17, was shot by an officer three times on Tuesday as he attempted to flee a car stopped by police. Rose was one of two passengers in the car, which matched the description of a vehicle that had been involved in an earlier shooting, Allegheny County Police said. 
 
 East Pittsburgh Police Officer Michael Rosfeld fired on Rose from behind, hitting him in three spots, police said. 
 
 The manner of Rose's death was listed as homicide, the Allegheny County Medical Examiner's Office said. 
 
 "Three shots in the back, how you justify that?" protesters chanted Friday. 
 
 Demonstrators carrying a sign that read, "Fire killer cops," led hundreds of supporters to the Homestead Grays Bridge, halting traffic for a few hours. 
 
 Those arrested face charges for failure to disperse and, at least one, for resisting arrest, McDonough told KDKA. 
 
 'He wasn't that boy' 
 
 Tia Taylor, who went to high school with Rose, addressed the crowd, offering a heartfelt testimony of him. 
 
 "He wasn't the person to be out here doing anything he didn't have no business doing. He wasn't that boy," Taylor, a student at Woodland Hills High School, said through tears. 
 
 Protesters gather Thursday, June 21, 2018, outside the Allegheny County Courthouse in Pittsburgh to call for justice in the shooting death of Antwon Rose. 
 
 Friday marked the third night of protests in Pittsburgh. Several groups since Wednesday have shut down highways and intersections across the city. 
 
 As it grew dark, police became more visible. Squad cars trailed the crowd, and officers in riot gear formed a tight line, holding batons and blocking protesters' way. 
 
 Rosfeld, the officer who shot Rose, had been sworn in to the East Pittsburgh police force just hours before the shooting, though he'd worked with other local departments for seven years, CNN affiliate WPXI reported. He has been placed on administrative leave, police have said. 
 
 Allegheny County District Attorney Stephen Zappala does not plan to refer the case to the Pennsylvania attorney general, despite calls for him to do so. Zappala's spokesman, Mike Manko, said in an emailed statement that "the major crimes investigative resources in Allegheny County are more than capable of handling any homicide case."
– Hundreds of people hit the streets of Pittsburgh on Friday for the third straight night to protest the police shooting of an unarmed teen, the Pittsburgh Post-Gazette reports. Angry over the death of Antwon Rose, 17, the protesters stopped and sang outside PNC Park just before 10pm as fans tried leaving a Pittsburgh Pirates game and found the home-plate gate locked. Four arrests were made, CNN notes, and a black Mercedes Benz pushed through the crowd, angering protesters who punched the sedan and chased it down West General Robinson Street. Police are still searching for the vehicle, TribLive reports. Things also got heated between some pedestrians and protesters. "I disagree with everything they are doing," said a passerby who shouted "blue lives matter" outside PNC Park. "I'm a big supporter of our military and police, and [the protesters] have no right to be obstructing people like they are." But the crowd, a mix of black and white, was mostly peaceful despite the presence of police in full riot gear. "We didn’t feel threatened at all," said a woman visiting from Austin, Texas. "There’s still this feeling of injustice and how much violence there is for young black men and they have to ask for justice and fairness." (See what a medical examiner said about the Rose shooting.)