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Grenades were discovered on the 600 block of Potrero Avenue this morning at around 7:15. According to BCN (via SFGate): "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 notes, "the 33 Stanyan bus is at a standstill, and the 9 San Bruno bus is being routed around the scene."

No word yet wether or not the explosives are fake, but you should stay out of the area this morning until further notice.

Update: All clear. Potrero Hill Avenue has reopened.