The bomb squad is attending after an explosion in Aliso Viejo
There are unconfirmed reports of explosive devices on the scene of the blast in Orange County.
The county’s bomb squad and a hazmat team are preparing to search the building where the explosion occurred.
One person was pronounced dead at the scene.
Two others were injured in the explosion. The extent of their injuries is not yet known.
Firefighters are on the scene of the Aliso Viejo explosion
The blast occurred at an office building at around 1.25pm local time (9.25pm BST).
The Orange County Fire Authority (OCFA) said the explosion occurred on the first floor.
The fire service initially said a vehicle may have crashed into the side of the building, but authorities later said this may not have been the case.
An Orange County Sheriff’s Department spokeswoman said: “We’re trying to determine if a vehicle was involved or if it was an accident or inside the building.”
Emergency services have closed the westbound carriageway of Pacific Drive. The westbound lanes are partly shut to the Aliso Plaza.
More to follow…