About 100 teenagers have been moved from a YMCA recreation centre in County Down after a suspected arson attack.
A fire was reported at Greenhill YMCA site in Newcastle at about 19:00 GMT on Saturday.
The fire was at a log cabin, used as a "shelter or relaxation-type area", the PSNI said.
"Unfortunately the cabin has been completely destroyed by the fire, which is believed to have been started deliberately," PSNI Sgt McIlveen said.
"Thankfully, there are no reports of injuries and no damage to the nearby main property."
John Peacock, the national secretary of YMCA Ireland, said the teenagers were having dinner in the dining hall when they were moved outside.
He added that while it has been reported that the fire was malicious, there was no evidence to indicate what caused it.
The police have appealed for information.