Explosion on movie set near LA leaves three people critically injured

Several people were injured Tuesday after a small explosion near a filming site in the hills north of Los Angeles sparked a fire, officials said.

Three people sustained critical burn injuries and were transported to a local hospital, Los Angeles County Fire Department spokesman and Battalion Chief Roland Sprewell told CNN. One other person reportedly made their way to the hospital, Sprewell added.

An initial call to 911 came in on Tuesday around 4:45 p.m. local time, Los Angeles County Fire Department Inspector Henry Narvaez told CNN.

A brush fire broke out and covered an acre but was extinguished by 120 firefighters and two water-dropping helicopters.