Police and emergency responders swarmed a downtown bank in Bakersfield, California, after a man allegedly threatened to detonate explosives and barricaded himself inside with at least one hostage, prompting evacuations, street closures, and lockdowns at nearby government buildings.

The incident unfolded shortly after 1 p.m. at a JPMorgan Chase branch in downtown Bakersfield, and no arrests had been made as of 11 p.m. Tuesday.