First responders say four people have been injured in an explosion at a Torrance apartment complex, the fire department said.

Torrance firefighters responded to the 23500 block of Anza Avenue just before 1:20 p.m. Sunday.

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In all, four apartments were damaged, two of which sustained “significant damage.”

Of the injured, two were said to have sustained significant injuries. Two others sustained minor injuries. source

A Hazmat team is at the scene.

The cause of the explosion was not known.