A derelict council building has been left heavily damaged after a blaze which fire crews believe was started deliberately.
And the culprits used fly-tipped materials to ignite the flames, it was also revealed.
Three engines and 15 firefighters from Hindley station were called to reports of a fire at the premises in Liverpool Road, Hindley, at approximately 10.50pm yesterday (Sunday, October 15).
Crews spent around 90 minutes tackling the fire.
Watch manager Mark Anderson reported that one of the rooms was completely destroyed by the fire, and that a lot of the roof space suffered significant damage.
"The structure was in such a poor state of disrepair that the walls were already falling down. It is in a bad way, it's quite a dangerous place," he said.
Mark also revealed that all signs pointed to the fire being ignited on purpose, most likely by youths.
He said: "We do know that the local homeless population use the building on occasion, but there were no signs of any recent occupation. It appears to have been empty for quite some time.
"I believe it was deliberately started. The assumption is that it is probably youths who have started it. That ground is used to fly-tip. It appears materials that have been fly-tipped were put into the room and set on fire."