Fire crews are investigating the cause of a blaze early today that left a house in Keighley in a dangerous state.

The fire broke out at 3.15pm in a property in Fell Lane that is undergoing renovation. No-one was in the building at the time.

Two fire crews were called, one from Keighley and one from Bingley, to deal with the blaze.

The fire damaged 50 per cent of the first floor and firefighters who attended the scene said damage to the roof meant the building was in a potentially dangerous condition.

The cause is under investigation and a building inspector was due to survey the property today to see if it is structurally safe.