Update at 3:15 p.m. — All lanes of I-395 in D.C. have been reopened.
Update at 12:00 p.m. — D.C. is telling Arlington that the accident was fatal (this has NOT been confirmed). Police are blocking I-395 on the D.C. side of the 14th Street Bridge to allow for an extended investigation. Traffic is being diverted onto 14th Street in D.C.