This post has been updated. 

Drivers on the Inner Loop of the Beltway in College Park are facing major delays this morning following a crash and vehicle fire involving a tractor-trailer, authorities said.

All through lanes of the Inner Loop have reopened, but the ramp to Route 1 remains closed. Traffic is getting by very slowly on the Beltway, and delays extend for several miles.

No additional details about the crash, its cause or possible injuries were immediately available.