PHILADELPHIA (AP) — State police have opened a driving under the influence investigation following the deaths of two Pennsylvania troopers and a civilian struck by a vehicle on an interstate in Philadelphia early Monday. Police said Trooper Martin F. Mack III and Trooper Branden T. Sisca were trying to get a pedestrian off I-95 when all three were struck by a vehicle traveling at a high rate of speed. The troopers and the civilian were pronounced dead at the scene. Police said the driver remained at the scene and a DUI-related investigation was opened. Gov. Tom Wolf ordered state flags to fly at half-staff in the troopers' honor.
![I95 sign](https://ewscripps.brightspotcdn.com/dims4/default/59d3853/2147483647/strip/true/crop/2000x1125+0+188/resize/1280x720!/quality/90/?url=http%3A%2F%2Fewscripps-brightspot.s3.amazonaws.com%2F5e%2F75%2Fc2c533614f0eb3662be5aa2d538b%2Fap9906020848.jpg)
AP
![I95 sign](https://ewscripps.brightspotcdn.com/dims4/default/59d3853/2147483647/strip/true/crop/2000x1125+0+188/resize/1280x720!/quality/90/?url=http%3A%2F%2Fewscripps-brightspot.s3.amazonaws.com%2F5e%2F75%2Fc2c533614f0eb3662be5aa2d538b%2Fap9906020848.jpg)
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