VIDEO: Authorities reported multiple injuries after a series of electrical explosions sent massive fireballs into the air Saturday night at a shopping and dining complex in Huntington Beach. Staff at the Old World German restaurant on Center Avenue noticed an odor coming from the underground electrical vault. The fire department was called to the scene - where the restaurant was holding an Oktoberfest event - and the first explosion erupted shortly after, around 8:30 p.m. Two firefighters were injured while investigating the initial explosion just before another one went off. Witnesses say the lights started to flicker and the power went out before up to three explosions only about a minute apart rocked the restaurant. Huntington Beach Fire Department officials say two firefighters and two civilians were injured, including a restaurant employee who led fire crews to the vault.