A suspicious back pack was reported in front of the Federal Building at 450 Golden Gate Ave. in San Francisco Friday afternoon, a police spokesman said.
A shelter in place was called because of the suspicious package by 2:30 p.m. The all clear sign wasn't given until about an hour later.
The package was reported at 12:51 p.m. near the corner of Golden Gate Avenue and Larkin Street, San Francisco police Lt. Troy Dangerfield said.
But the police response caused an impact on traffic on Polk Street between MicAllister and Turk and on Golden Gate Avenue between Van Ness and Hyde.
An unidentified male approached the marshal, pointed to the backpack, and said it had an explosive device in it, Dangerfield said.
The male left the scene and the marshal called 911, he said.
The Police Department's bomb squad responded and is investigating the backpack, according to Dangerfield.
The male who allegedly made the anti-government statements and said explosives were in the backpack had not been found as of 2:30 p.m., Dangerfield said.
The department's bomb squad has responded to the scene, Dangerfield said.
Federal officials in charge of security for the building were not immediately available to comment on the incident, but an announcement came over the intercom at the building around 1 p.m. notifying people inside about the suspicious package.
Golden Gate Avenue was closed between Polk and Larkin streets as of 1:15 p.m. due to the investigation into the package.