San Francisco police late Thursday investigated another suspicious device, this time at the San Francisco Mission Police Station on Valencia Street.
The device was later deemed safe, official said.
The investigation followed another police response to suspicious device several hours earlier in the night. The police activity prompted a shelter in place for the 100 block of Duboce Avenue, police said.
The suspicious device was found at a nearby skate park, police said, and a bomb squad was called to the scene.
The bomb squad rendered the device safe and the shelter in place was lifted at about 8:50 p.m.
Earlier in the day, the San Francisco Hall of Justice was put on lockdown while police investigated a bomb threat in the area of 7th and Harrison streets.
The investigation also shut down Interstate 80 and U.S. Highway 101 for nearly three hours in the area.
San Francisco police said that a suspicious note left on a car on the 400 block of 7th Street prompted the investigation, but declined to describe its contents.