The Cannon House Office Building on Capitol Hill was evacuated after an alarm sounded. But it was given an all-clear a short time later.

There are no reports yet on why and whether it was related to the string of explosive devices being received by politicians and media throughout the nation this week.

The Hill reports the alarm went off and people were urged to calmly evacuate. Nearby Independence Avenue was shut down as authorities investigated.

The building was built in Washington D.C. in 1908, according to the Architect of the Capitol website. In 1962, the building was named for former Speaker of the House Joseph Gurney Cannon. It's located just south of the Capitol Building.

All clear at the Cannon building. Allowed everyone to have a long lunch on a crisp fall day. pic.twitter.com/SXyrxjh1TM — Jamie Dupree (@jamiedupree) October 25, 2018

Fire trucks outside Cannon building pic.twitter.com/b3lkJsVcBu — Olivia Beavers (@Olivia_Beavers) October 25, 2018

Recent packages sent in the mail to Democratic politicians have the nation and its capital city on edge this week. At least 10 bombs have been received or intercepted. None have detonated to harm an individual.

Authorities are working to figure out why the bombs are being sent, and from who.