Chief Fennesy noted the building where the explosion occurred was being renovated.
There was a daycare located across the street from the building with the explosion, but officials confirmed no children were injured and they were working to reunite the kids with their families.
Law enforcement ordered nearby Academy on the Hills day care and preschool to evacuate and children were rolled in cribs and walked hand-in-hand down the street. None of these children were hurt. A woman was pronounced dead at the scene, and three others were injured, OCFA said. They expected a lengthy investigation to determine the cause. The injured were taken to a hospital.
Footage taken from a news helicopter shows part of the structure has been blown off by the explosion.
Former UFC star WATERBOARDS himself in freaky Donald Trump statement
Haspel - who would replace now-Secretary of State Mike Pompeo in the role - has gotten support from lawmakers on the left. But she added that the interrogation program "ultimately did damage to our officers and our standing in the world".
One person was killed and three others were injured on Tuesday in an explosion at an office building in the US state of California, authorities said, Xinhua reported.
The explosion at the office building in Aliso Viejo - about 50 miles (80.5 kilometers) south of Los Angeles - blew siding off the walls, exposing insulation and framing. No children were hurt, officials said.
The official, who was briefed on the investigation, was not authorized to discuss the matter publicly and spoke to The Associated Press on condition of anonymity.
Orange County Sheriff's Cmdr. Sheriff's officials said the size of blast made it suspicious.
Tigers split doubleheader against Mariners
Castellanos was hit on the hand in last night's game, but X-rays confirmed there's nothing seriously injured. In the first game, Matthew Boyd (2-3) allowed three runs and three hits in six-plus innings for the Tigers.
Authorities have not yet found explosive devices in the area, according to officials.
Bomb technicians from the Orange County Sheriff's Department, the Federal Bureau of Investigation and other agencies were investigating, said Paul Delacourt of the Federal Bureau of Investigation.
Witness Mary Mack-Williams described the chaotic scene immediately after the explosion, saying he saw bloodied women fleeing from the building, their faces were covered with ash.
Mary McWilliams tells the Orange County Register that she arrived for an appointment Tuesday in Aliso Viejo to find smoke surrounding the area and auto alarms going off.
Pyongyang: Nuclear test site will be dismantled between May 23-25
Pyongyang has scheduled the dismantlement of its nuclear test site for sometime between May 23 and 25 depending on the weather. Kim revealed plans to shut down the nuclear test site during his summit with South Korean President Moon Jae-in last month.