An investigation is under way into the cause of a major blaze at a welding company in Keighley last night.

More than 40 firefighters were called to Coney Lane Welding in Russell Street after flames were seen pouring through the roof at about 10.30pm.

Crews remained at the building until 3am today.

A spokesman for Keighley fire station said damage was caused to half the roof and office space.