Arson crews are trying to figure out what started a fast-moving fire inside a repair shop.

It broke out at around 10 p.m. Thursday inside a building on Carlang near Langcart in Channelview.

Firefighters say the shop was used to repair cars, and some of the machines inside burned up.

No vehicles were inside at the time of the fire.

The building was also gutted by the fire, but it did not reach the owner's home that is next to the shop.

No injuries were reported.