Authorities say an FBI agent and a state fire marshal were struck and killed while standing on the shoulder of I-270 in Montgomery County.
At about 10 p.m. Friday, one of the officers was at the scene of a single-vehicle traffic crash on southbound I-270. Police say he requested assistance and used his car to block the damaged vehicle from oncoming traffic.
The officer then learned the driver of the disabled vehicle was also an officer. Both men moved to the shoulder, where they were standing when a vehicle approached them.
Officials say the vehicle swerved to avoid hitting cars in the other lane and struck both officers. Both men were thrown over the road partition, where at least one of them was struck by a car traveling northbound.
One officer died on the scene, according to police, and the other was transported to Suburban Hospital where he later died.