A derelict building at an allotment is believed to have been set alight deliberately.
Firefighters from Wigan were called to the site at the rear of Bolton Road, in Stubshaw Cross, at 1.30pm today.
A derelict former garage was on fire and crews spent around 30 minutes tackling the blaze.
The building was destroyed but the flames did not spread further.
It was suspected that the fire had been started deliberately and the police were informed.