SAN FRANCISCO (KTVU) - Four people were detained after breaking into a warehouse in the Bayview district at Rankin and Oakdale.
According to police, there is a marijuana grow operation inside the warehouse. It's not clear if the grow operation is legal or not.
The suspects pried open a gate and propped it open with a tire as they entered the warehouse.
The owner of the building saw the break in on surveillance video and called police.
Police and SWAT blocked off a two block area as they investigated and detained the four suspects.
It's unclear how much marijuana was in the warehouse.
At this point, additional details have not been released.