7 injured in truck and fire engine crash on I-495

LANHAM, Md. -  

Seven people are injured, including four firefighters, after a serious crash on the Capital Beltway involving a fire engine and a tractor-trailer in suburban Maryland.
Prince George's County fire officials say the tractor-trailer rear-ended the fire engine just before 3 a.m Wednesday.
That caused both trucks to flip over and strike an SUV on other side of the highway. The SUV also overturned.
The crash happened on the Inner Loop of Interstate 495 just south of U.S. 50.
Both sides of the Capital Beltway were closed after the crash.
Now one lane is open in each direction, and there is a long traffic backup. 
Morning commuters are being urged to avoid the area.
The firefighters are from the West Lanham station.
They were responding to an accident in the area.