A flurry of 911 calls about an active shooter began at 10:22 p.m. local time, lasting about 30 seconds, Monterey Park Police Chief Scott Wiese said at a Monday afternoon briefing. Officers responded about three minutes later, running into the dance studio as attendees were fleeing. “Imagine people going out and my officers swimming upstream to get inside to stop the problem,” he said. Wiese said he arrived at the scene within 20 minutes and soon called the Los Angeles County Sheriff. Outside of the dance studio, officers discovered one of the victims had been shot in their car, likely before the rampage began.