Stonestown Galleria was evacuated Wednesday afternoon due to police activity and a vague, phone-in threat — possibly involving an armed individual — and the mall eventually reopened after several hours.There was a mass evacuation of Stonestown Galleria on San Francisco's west side Wednesday, wit h a large emergency response that began around noon.SFist co-founder Eve Batey reported from the scene that as of 1:21 pm the mall and the adjacent movie theater remained fully evacuated. And, she says, an SFPD officer on the scene said vaguely, "People call in and say stuff and we have to investigate."The Chronicle initially reported via police dispatch records that the SFPD was called to the scene at 11:41 am on a report of a person with a gun.The department later confirmed that they had received a threat mentioning the Stonestown mall specifically on their non-emergency dispatch line, which is what prompted the response.The mall ultimately reopened around 3 pm."We were able to quickly, within a couple hours, sweep the entire mall, make sure that everything is safe. Nothing was found, no suspects found and it will be investigated later by investigators downtown," SFPD Captatin Clayton Harmston told reporters outside the mall, per the Chronicle. "I don’t have any specifics about the threat because it’s an open investigation, but our priority is to make sure that everybody is safe at Stonestown, which was our number one goal."San Francisco's Department of Emergency Management issued an alert — which didn't get pushed to all cellphones apparently, because I didn't get it — saying, "Expect traffic delays, consider alternate routes, and allow for additional travel time." This is the first time in recent SF memory that anything as large as Stonestown Galleria has had to be evacuated over any kind of threat situation.Photo via Google Street View ...read more read less