Update, 10:04 a.m.:

The 3rd Street tunnel has completely reopened after D.C. police cleared a suspicious vehicle that blocked the northbound side of the tunnel this morning, reports DDOT.

Original post:

The northbound side of the 3rd Street tunnel is closed this morning as D.C. police investigate a suspicious vehicle, authorities reported.

About 8:30 a.m. an unattended dump truck was discovered inside the tunnel. Any vehicle left unattended is considered “suspicious,” said a police spokesman.

Northbound lanes are closed to traffic indefinitely until police can clear the truck. Drivers are advised to avoid the area.

Stay with PostLocal for more information as details become available.