Police say the Key Bridge in Washington, D.C., has been shut down in both directions between Georgetown and Rosslyn in response to a bomb threat. Authorities are reportedly searching for explosive devices.

https://twitter.com/howardonna/status/355341079815536640

Police say drivers should avoid the area for several hours.

Twitchy will monitor this developing story and update as details become available.

Update:

All lanes have reportedly reopened after the bridge was deemed safe by authorities.