Two off-duty law enforcement officers were struck and killed while standing on the shoulder of I-270 in Montgomery County, Maryland at the scene of a traffic crash, police said.

RELATED: 2 people thrown from car after accident on I-270

Around 10 p.m., one of the officers was out I-270 near the single-vehicle crash. He requested assistance and used his car to block the damaged vehicle from oncoming traffic.

Both men moved over to the should of the fast lane when a southbound vehicle began to approach them.

Maryland State Police said the driver of that vehicle swerved to avoid hitting vehicles in one lane and ended up hitting the officers.

Both men were thrown over the jersey wall to the northbound side of I-270, where it appears at least one of them was struck by a northbound vehicle.

According to officials, one officer died on the scene and the other was transported to Suburban Hospital where he was pronounced dead.

The driver and one passenger in the vehicle that struck the men were taken to Suburban Hospital.

A second passenger in that car was taken to Shady Grove Hospital. The driver of the northbound vehicle that struck one of the men reported no injuries.

Maryland State Police said they would identify the victims later, Montgomery County Fire PIO Pete Piringer said and a Deputy Chief fire marshal and an FBI agent were killed in the crash.

“Sadly, @mcfrs learned this morning of the untimely passing of Sander Cohen,” he tweeted.

Cohen was a Lieutenant with the Rockville Volunteer Fire Department and a Deputy Chief with Maryland State Fire Marshal’s Office, Maryland State Police.

Police said there is no indication of alcohol involvement in these crashes. The causes of the initial crash remain under investigation.

No charges have been filed at this time.

No additional information has been released at this time.