Philadelphia, PA – Pennsylvania State Police (PSP) Trooper Martin Mack and Trooper Branden Sisca died in the line of duty Monday morning when they were hit by a speeding motorist while trying to get a pedestrian off of the interstate.

The incident began on Interstate 95 southbound at approximately 12:30 a.m. on March 21, when the Trooper Mack, 33, and Trooper Sisca, 29, stopped a female driver on suspicion of DUI, WCAU reported.

During the traffic stop, the troopers were notified that a man was walking on the roadway and they were forced to leave the stop in order to locate the pedestrian, law enforcement sources said.

The troopers located the pedestrian and were trying to get him into their patrol vehicle when a vehicle traveling at a high rate of speed slammed into all three of them, according to police.

The force of the impact threw the troopers and the pedestrian into the northbound lanes of the interstate.

Witnesses rushed to the injured troopers and attempted CPR, but all three victims were pronounced dead at the scene, Philadelphia Police Department (PPD) Traffic Division Officer Mike Staten told reporters.

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