LOS ANGELES, Aug. 23 (Xinhua) -- A fire broke out at a Tesla factory in Fremont in the U.S. state of California on Thursday, but no injuries were reported.

The fire started at a large pile of cardboard and threatened nearby structures, according to reports from the local fire department.

It has been extinguished and no one was injured, the firm's Chief Executive Elon Musk said on his twitter.

"I was just there. Cardboard being prepped for recycling along southern fence line caught fire. Super appreciate fast response by Fremont fire dept! No injuries or damage to factory." Musk tweeted.