While dousing a one-alarm blaze at a home in San Francisco’s Outer Richmond neighborhood, firefighters discovered a marijuana grow operation.

Crews responded to a report of a fire at a multi-story, single-family home in the 500 block of 35th Avenue, which is near Geary, at about 12:30 a.m., officials said.

The fire was contained at 1:05 a.m., according to officials.

While crews were at the home, they discovered a marijuana grow operation, police Sgt. Dennis Toomer said.

Details about the operation were not immediately available.

No one was injured in the fire. The cause is under investigation.

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