Residents in San Francisco's Noe Valley neighborhood were evacuated Friday afternoon after police detained a man and then called the bomb squad to the area, a police spokesman said.
The scene was cleared by 4:30 p.m. when everyone was allowed back into their homes.
It all begain around 12:40 p.m., when police were notified about a suspicious person in the 4100 block of Cesar Chavez Street, Officer Gordon Shyy said.
Arriving officers found a man in the carport area of a residential building and detained him.
While responding, officers determined there were a suspicious object or substance in the area and called for the department's bomb squad and hazardous materials team to come to the area.
Homes on the dead-end street were evacuated around 1:45 p.m. and the intersection of Castro and Cesar Chavez streets was blocked off to pedestrians and motorists, Shyy said.
The area was reopened by 4:30 p.m.
No injuries have been reported, Shyy said.