A manhunt is on for alleged cop killer Rahmael Sal Holt, 29. He has been identified as the “armed and dangerous” gunman who allegedly shot and killed New Kensington police officer Brian Shaw on Friday, according to Pennsylvania State police.

Authorities have filed charges of first-degree murder and murder of a police officer against Holt on Saturday, according to a report from Fox News.

Police want anyone with information about the suspect to call 9-1-1.

Shaw, 25, was shot in the chest Friday night during a foot pursuit that started after a traffic stop in New Kensington, which is located approximately 18 miles outside of Pittsburgh. Investigators are still determining on Saturday why Shaw had initiated the traffic stop that ultimately led to his being shot to death.

Later Friday, police located a brown, older model Jeep Grand Cherokee that was sought in connection with the shooting.

People in the Pittsburgh area have responded to the killing with an outpouring of sympathy for Officer Shaw’s family and support for regional first responders in general. Tributes included a moment of silence at Saturday night’s NHL hockey game between the Pittsburgh Penguins and Chicago Blackhawks, and a tweet from NFL head coach Mike Tomlin of the Pittsburgh Steelers.