Concussive 'booms' that shook windows across East Anchorage, Airport Heights and Rogers Park Tuesday morning were caused by explosives training being conducted on Joint Base Elmendorf-Richardson.
JBER spokesperson Jim Hart said that the loud booms are the result of a training exercise for the base explosives ordnance disposal unit. Hart said the unit was detonating the explosives -- 106-pound charges consisting of small ammo and grenades -- on the base's Explosive Ordnance Disposal pad.
Training was expected to be finished between 3 and 4 p.m. Hart said updates would be posted on the base's Facebook page.