An oven exploded at a jail in Northern California this week, critically hurting one inmate and injuring 10 others, including a guard.

The natural-gas explosion occurred at about 11:30 a.m. Tuesday at the Santa Rita Jail in Dublin.

The oven's door, which measures 7 by 3 feet and weighs several hundred pounds, flew off in the explosion and hit an inmate kitchen worker in the head, Alameda County Sheriff's Sgt. J.D. Nelson told the San Francisco Chronicle.

"You could see a very heavy stainless steel door that is on the ground and, obviously, it knocked a few things down along its path," Nelson said. "It was a significant explosion."

Four people were taken to a hospital, and seven others were treated at the jail, officials said.

The exact cause of the explosion remains unknown.

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ari.bloomekatz@latimes.com