ARSONISTS targeted a derelict mansion five times last month.
Firefighters are now warning young people about the dangers of hanging around at Popeley House in Liversedge, and similar derelict properties.
Batley Fire Station Manager Andy Crowther said it was only a matter of time before someone got hurt.
He said: “The building on Leeds Road is clearly becoming a place where some local youths are hanging about.
“As each of these fires occur the strength of the building is becoming more and more unstable.
“I’ve a real fear that someone is going to get hurt whether it is a member of the public or a firefighter.
“Some of the fires have been quite substantial and caused a lot of damage.”
On August 14 firefighters spent two hours tackling flames that had engulfed the whole staircase at the Leeds Road house.
Station manager Crowther told the Examiner people should be aware of the legal implications of going into derelict properties and starting fires.
He said: “I would ask all local residents report immediately to the police if you suspect unauthorised people are entering sites.”