More than 400 volunteers from the Ahmadiyya Muslim Youth Association (AMYA) have helped to plant 2,200 trees as part of the Red Rose Forest community project in Urmston.
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Emergency services attended and a man, believed to be in his 40s, was found dead at the scene.
Bright and warm on Sunday with a muggy night to follow
According to police, the building involved is derelict, but was once used as a hostel.