Locals in Killarney were "outraged" after video footage emerged of late-night party scenes on the streets of the town.
The footage shows a large group of people gathered on Main Street in the Co Kerry town on Saturday night, with some seen standing on a telephone box and bins.
Chanting revellers can be seen crowded onto the footpaths, with little social distancing visible.
The footage was viewed more than 200,000 times on social media yesterday.
Mayor of Killarney councillor Brendan Cronin condemned the scenes, describing them as "absolutely shocking" and "appalling".
He called for a full investigation into how the incident occurred. "This is a slap in the face to all the great work in Killarney that has been done to make our town safe.
"I have contacted Superintendent Flor Murphy, Killarney Chamber of Commerce, and Kerry County Council management to arrange a meeting to discuss the situation. There needs to be a full investigation," he said.
Kerry County Councillor Jackie Healy-Rae said yesterday there was anger locally over the incident.
"The people's behaviour last night was completely unacceptable.
"There is outrage from the local people in Killarney and in Kerry over what went on in Killarney last night.
"We have students who are going back to school tomorrow, we have teachers who are going back to school tomorrow, we have parents who are worried about schools reopening tomorrow, and then we have this sort of behaviour. So, it's not good," he said.
The Vintners' Federation of Ireland (VFI) called for the "full force of the law" to be applied to bars breaching guidelines, although it remains unclear how the gathering began.
"The VFI has reiterated its call for the full force of the law to be applied to any pub found to be in breach of guidelines following a number of incidents in Killarney on Saturday night, which involved large groups of people gathering on the streets in contravention of all current protocols," it said in a statement.
"While the exact nature of what occurred prior to the incidents that appeared on social media remains unclear, the guidelines for restaurants and pubs serving food state that alcohol can only be served along with a €9 meal and guests can only remain on the premises for 105 minutes."
The VFI said it supported new Garda powers to close down businesses found to be not complying with Covid-19 regulations.
A Garda spokesperson said it did not comment on footage circulating on social media.
However, they said there were patrolling resources in the Killarney area.
"An Garda Síochána had resources on patrol in the Killarney district, with local gardaí reporting a large numbers of persons socialising in Killarney over the evening," they said.
The phone calls started to flood in about two weeks ago. In scenes similar to those that played out in early March, patients were listing off their symptoms, worried they might have Covid-19. "Sniffles, coughs, sore throats," Monaghan GP Illona Duffy told the Irish Independent.