Updated at 5:02 p.m.

Two accidents that both occurred near the overpass near the Shirlington exit of Interstate 395 in Arlington shut down traffic in both directions on Wednesday afternoon.

As of 4:30 p.m., an Arlington police dispatcher said that traffic was moving again in all lanes but that it remained slow in the aftermath of the earlier lane closings.

A fire department spokesman said that the first crash, involving a minivan and a sedan, injured three people. Police spokesman Dustin Sternback said that the two vehicles collided, propelling them both into a wall and then causing one to flip over.

The driver of the sedan suffered serious but not life-threatening injuries. Two people were trapped in the minivan and had to be rescued by emergency responders. Their injuries were also serious but not life-threatening, the fire department spokesman said.

About 35 minutes after the first crash, two cars merging off of I-395 collided as a result of rubber-necking, Sternback said. No one was injured in the second accident.