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Fire crews in Pasadena are battling one of the largest structure fires the city has seen in years.

A firefighter became temporarily trapped and sent out a mayday call.

A hazardous material team is assisting with burning lithium ion batteries.

More than 100 firefighters and a hazardous materials team are working to combat a fire involving lithium ion batteries and prototype cars at General Motors’ design studio in Pasadena, authorities said.

At one point, a firefighter was trapped in the structure amid the ferocious blaze and sent out a mayday call.

The Pasadena Fire Department responded to the fire in the 600 block of Sierra Madre Villa Avenue at 5:50 p.m., according to departme

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