The HOV lanes of I-395 have been shut down near the Glebe Road exit due to a serious accident involving a motorcycle.

Initial reports indicate the accident was caused when a vehicle ran into a motorcycle. The motorcyclist is being treated for critical injuries and will be transported to a local trauma center via ambulance, according to Arlington County Police spokesman Dustin Sternbeck.

All HOV traffic is being diverted onto the main southbound lanes of I-395. Southbound backups extend to the 14th Street Bridge.

Charges are pending against the striking driver, Sternbeck said.