police-light-bar1.jpg2:37 PM: A suspicious package that prompted a shelter-in-place warning at the Federal Building at 450 Golden Gate Ave. in San Francisco this afternoon has been deemed harmless.

“The situation has been resolved. All clear, all clear,” the building’s occupants were told over a loudspeaker at 2:20 p.m.

The package was discovered on a conveyor belt in the building’s basement mailroom at about noon, San Francisco Police Officer Albie Esparza said.

Esparza said the department’s bomb squad aided in the probe.

During the two-hour investigation, occupants of the fourth through 20th floors of the building were instructed to shelter in place.

People on the first through third floors were told to move to the Turk Street side of the building, and those on the basement and sub-basement floors were evacuated.

1:48 PM: Occupants of the Federal Building at 450 Golden Gate Ave. in San Francisco have been told to shelter in place because of a suspicious package.

San Francisco police spokesman Officer Albie Esparza said the department’s bomb squad is at the scene assessing the situation.

He said the suspicious package was discovered on a conveyor belt in the building’s basement mailroom around noon.

Both the front and back entrances to the building are closed.

The probe is being led by federal investigators and police are providing “lateral support,” Esparza said.

Occupants of the fourth through 20th floors of the building have been instructed to shelter in place.

Those on the first through third floors have been told to move to the Turk Street side the building, and those on the basement and sub-basement floors have been evacuated.

Julia Cheever, Bay City News

1:04 PM: Occupants of the Federal Building at 450 Golden Gate Ave. in San Francisco have been told to shelter in place because of an unspecified emergency. In addition, according to AlertSF, “northbound Larkin Street between Golden Gate Ave and Turk Street is closed for approximately 1 hour.”

An announcement over the building’s loudspeaker early this afternoon stated that emergency crews were responding to a situation. No details were given.

The building’s occupants were told, “this is not a drill,” and were instructed to shelter in place until further notice.

People on the first through third floors were advised to move to a higher floor.

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