Studio fire was accident

A fire that ripped through the heart of Universal Studios in Hollywood on Sunday was an accident, fire chiefs have ruled.

Los Angeles County Fire Chief P. Michael Freeman says the blaze was accidentally sparked by workers using heating tools on a film set.

The fire destroyed a 'King Kong' exhibit and the set from the 'Back To The Future' movies.

It's the second blaze at Universal Studios in 18 years. The last one, in 1990, was started by a security guard and caused $25m worth of damage.