From multiple news sources,
Possibly explosive devices were found Thursday morning in San Francisco's Potrero Hill neighborhood, prompting a closure of several surrounding streets, a police spokesman said.
Grenades were found 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.
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.
SF Appeal Update 9 AM: Potrero Ave has been reopened.
SJ Mercury News