Grenades were found at about 7:15 a.m. in a building in the 600 block of Potrero Avenue, San Francisco police Lt. Troy Dangerfield said.
Bomb technicians were at the scene as of 8 a.m. to investigate the devices, Dangerfield said.
“We’re not sure whether they’re real or fake,” he said. Speaking to KTVU broadcast, Dangerfield said that the owner of the building had passed away, and his family was cleaning the garage when they came across at least five or six items that might be grenades, and called SFPD immediately.
SFPD is, Dangerfield said, searching the rest of the house to see if any other devices are on the property.
Potrero Avenue has been closed between Mariposa and 19th streets, and 18th Street has been closed between Hampshire and Utah streets during the investigation, Dangerfield said.
According to KTVU broadcast, the 33 Stanyan bus is at a standstill, and the 9 San Bruno bus is being routed around the scene. As of 8:49, there was no word on when the streets would be reopened.
“We want to take our time” Dangerfield told KTVU broadcast.
Update 9 AM: Potrero Ave has been reopened.
Eve Batey contributed to this report by Dan McMenamin of Bay City News