The locks of 28 hall doors were glued shut in an act of vandalism in Letterkenny, Co Donegal.
Gardaí are investigating the incidents at Ballymacool Terrace, Convent Road and Ard O'Donnell, which happened between 1.20am and 7.30am yesterday morning.
CCTV footage is also being examined.
Two cars were also damaged in an incident at Glenoughty Close and three youths have been arrested in connection with this.
