Firefighters called to a blaze at a terraced house in Bradford uncovered a cannabis factory hidden in the attic today.
Two crews from Bradford fire station were called to the home, in Dudley Street, off Dick Lane, Tyersal, at about 4am.
The fire had broken out in the loft, but the crews soon discovered it had been sparked by electrical equipment servicing a cannabis growing operation.
They called police at about 4.40am.
Bradford fire station crew commander Jamie Collins said the roof joists and other items in the loft had been burning.
He said: “Most of the damage is to the roof, so the roof will probably need replacing.
"It’s burned through a lot of the roof joists supporting the tiles, and we had to strip part of the roof away.”
He said no adjoining properties had been affected, and no-one had been hurt.
A police spokesman said an 18-year-old man had been arrested on suspicion of cannabis production and the investigation was ongoing.