An FBI agent and a state fire marshal's office official died Friday night after they were struck by a car at the scene of a crash on Interstate 270 in Montgomery County, Maryland State Police said.

State police said Deputy Chief State Fire Marshal Sander Cohen, 33, called the Rockville barrack around 10 p.m. to report a single-vehicle crash in the fast lane of southbound I-270 near Gude Drive. Cohen blocked the crash scene with his personal vehicle and activated his emergency flashers.

The driver of the damaged car was FBI Supervisory Special Agent Carlos Wolff, 36. Both men moved to stand in the shoulder while waiting for assistance to arrive, state police said.

State police said an oncoming car swerved to the left, apparently to avoid the stopped vehicles, and struck both men on the shoulder of the highway. Both men were thrown over the jersey wall onto the northbound side of I-270, where at least one of them was struck by another car.

Cohen was pronounced dead at the scene. Wolff was taken to Suburban Hospital, where he died.

The driver and a passenger inside the vehicle that first struck the men were taken to Suburban Hospital. Another passenger was taken to Shady Grove Hospital.

The driver of the car traveling northbound was not injured.

State police said there is no preliminary indication of alcohol involved in the crashes.

No charges have been filed, and an investigation continues. All drivers remained at the scene.

Cohen was a decorated fire marshal who had been repeatedly acknowledged for outstanding service, state police said. He also served with the Rockville Volunteer Fire Department.

"Deputy Chief State Fire Marshal Sander Cohen was an exemplary investigator and leader who took great pride in his law enforcement career and who devoted himself to protecting and serving the citizens of Maryland," Maryland State Fire Marshal Brian Geraci said. "Sander will be missed by all those who had the pleasure of knowing him. We will forever keep the Cohen family in our thoughts and prayers."

"Deputy Chief Cohen had no idea who was inside the vehicle he stopped behind," Maryland State Police Superintendent Col. William Pallozzi said. "He just recognized that someone needed help and he never hesitated last night to stop and help someone in need. Deputy Chief State Fire Marshal Sander Cohen has now joined the ranks of Maryland’s Fallen Heroes."