A driver is dead after his vehicle crashed through a roadside barrier on the Clara Barton Parkway early Monday in the District near the Montgomery County line, police said.

U.S. Park Police and D.C. firefighters responded shortly after midnight to the scene at Little Falls Branch Bridge, extricating the pinned driver from an eastbound vehicle lying 20 yards down an embankment on its side against a tree at the west end of the bridge, they said.

The man, identified as Murat Siyam,45, from Rockville, was transported with critical injuries to a nearby hospital where he was pronounced dead, police said. An investigation into the crash is continuing, U.S. Park Police spokeswoman Sgt. Roselyn Norment said.