AN ARSON investigation has been launched after a building was deliberately set on fire in Darwen this morning.

The incident happened at the derelict Mayfield House in Tockholes Road at 6am.

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Two fire engines from Darwen and one from Blackburn attended the fire.

Crews used two hosereel jets and three higher-output jets to extinguish it, and a portable fan unit to divert the smoke and heat.

Nobody was injured and the police have been notified.