Fifty Montreal firefighters battled a major industrial fire in Riviere-des-Prairies on Thursday morning.

Flames poured from roof of a two-storey commercial building on 11,680 54th Avenue. at 7:30 a.m.

The structure, made of cement blocks, houses a paint shop for cars. There were no cars in the shop at the time and no reports of injuries.

It's not known what caused the fire.