Gardaí in Sligo Town are refusing to enter their own station today.
Dozens of officers based in the building say it is overcrowded and unsafe.
Members of the Garda Representative Association (GRA) say they will not return until conditions improve.
A similar protest planned last year was deferred after commitments from Garda management to address the issues - but, 13 months later, the GRA says 'nothing substantial' appears to have been done.
Garda Ray Wimms is a divisional representative for the force in the Sligo-Leitrim division.
He explained: "It's regrettable we find ourselves in this position.
"All my colleagues here at Sligo Garda Station this morning... none of them have refused to go to work. They're refusing to enter Sligo Garda Station on health & safety grounds."
He added: "Every member that's due to work this morning is working - we want to ensure there's no disruption to the service provided to the people of Sligo. Every patrol car will be out, every call will be answered."
He noted that a contingency plan that has been implemented by the local superintendent, meaning there is an emergency control room offsite that's being used during the protest.