Thieves broke into the Aura Leisure Centre in Letterkenny overnight.
The gang are understood to have gained entry through a side door and attempted to steal a number of items.
Management at the centre have been forced to close the swimming pool area until further notice.
Garda forensic experts are this morning carrying out a full investigation into the break-in.
Clubs and individuals looking to use the pool earlier this morning were told that the pool was closed temporarily.
The gym area of the popular centre remains open, however.
Staff are currently undertaking a stock-take of the premises to see what exactly is missing.
More to follow on this story.Tags: