Police officers in San Francisco are scouring the city for a semi-automatic assault rifle stolen from a police vehicle over the weekend, authorities said.
Unidentified suspects smashed one of the unmarked car's windows and stole an AR-15 rifle while officers worked nearby, Officer Albie Esparza told NBC News.
The high-powered weapon is distributed to trained police officers so that it is at hand for rapid deployment during high-risk events, Esparza said.
"No resource is being spared to recover this weapon," Esparza said.
Police do not know how the suspects determined the unmarked vehicle belonged to the police department.
The AR-15 assault rifle was the weapon used in last year's movie theater shooting in Aurora, Colo.