LOS ANGELES _ A transformer exploded Saturday night at the Old World Village's Oktoberfest celebration in Huntington Beach, prompting a large emergency response, authorities said.
A call came in after 8 p.m. PDT about a transformer explosion at the festival, said Jeff Lopez, spokesman for the Huntington Beach Fire Department.
Two firefighters and two civilians were injured in the electrical vault explosion, he said. Their injuries were described as minor.
A video posted on social media showed a large fireball erupting at the site on Center Avenue.
Pat Brassil, 27, was outside one of the tents at the festival waiting for his fiancee and sister to return from the bathroom when he saw flames shoot out from another tent near the festival's entrance.
He said this sent him scrambling to find his fiancee and moments after they were reunited, another blast occurred.
"It just lit up the sky," he said. "Everyone was going pretty crazy and screaming."
"The tent exploded once and then exploded again in the same spot."
More than 360 customers in the surrounding area were without power as of 9:50 p.m., said Susan Cox, a spokeswoman for Southern California Edison.
She said the utility was still trying to determine what caused the explosion.
