A man in his 30s was arrested in Letterkenny on Wednesday night in connection with a fire at a Monaghan Garda Station on Monday.
The fire occurred at Emyvale Garda Station, Co. Monaghan, in the early hours of Monday morning.
Gardaí carried out a number of searches this evening in Emyvale and Letterkenny.
A Garda spokesperson has confirmed that a man has been arrested in Letterkenny and is being detained at Letterkenny Garda Station under section 4 Criminal Justice Act 1984.
The man, arrested on suspicion of arson, will be interviewed by the investigation team from Monaghan.
Searches involved Detective and Uniform Gardaí from Monaghan assisted by colleagues from Donegal.
The Garda spokesperson said: “Investigating Gardaí continue to appeal for any witnesses to this incident or anyone who may have noticed anything suspicious in the area between the hours of 3am and 5:30am to come forward.
“Gardaí continue to appeal to any motorists travelling in the area between 3am and 5:30am who may have dash-cam footage to contact Gardaí.
“Anyone with information is asked to contact Monaghan Garda Station on 047 77200 or the Garda Confidential Line on 1800 666 111.”