Update, 7:24 a.m.:

All southbound lanes of Interstate 95 in Beltsville have reopened following a fatal crash Wednesday morning, Maryland State Police confirmed.

Major delays remain, with traffic backed up about four miles, authorities said.

The cause of crash, in which one person was killed, remains under investigation. No additional details have been released by police.

Original, 5:50 a.m.

Three of four lanes of southbound I-95 in Beltsville were blocked Wednesday morning after a fatal crash near the exit to the Inter-County Connector, Maryland State Police said.

Sgt. Jonathan Hill said only the right lane is getting by starting north of the ICC, and advised commuters heading toward Washington on I-95 to take alternate routes.

The closure will last at least until 7:45 a.m., and possibly through the morning rush, Hill said. Motorists can access I-95 via Route 212, south of the accident site.

No details of the 3:20 a.m. fatal crash were immediately available.