Police say drones helped lead to several arrests after a “flash mob” robbery that was caught on video in San Ramon, California, on Monday afternoon. The San Ramon Police Department says about 25 people stormed Heller Jewelers at the City Center at Bishop Ranch and began smashing display cases with pickaxes. While the smash-and-grab was over in a matter of minutes, a department drone that arrived on the scene before officers captured clear images of the suspects and their vehicles as they fled. T