"Drogheda United chairman Jim Agnew, manager Mick Cooke, the board of management and players wish to express their absolute disgust and embarrassment at the despicable behaviour of a number of so-called Drogheda United fans at the Sligo Rovers v Drogheda United match in Sligo," the club said in a strongly worded statement.
"The club wishes to express its sincere apologies to its own decent supporters who attended the game and who were shocked and appalled by the behaviour. We also apologise to Sligo Rovers' officials, manager, players and supporters for the utter disregard that these individuals displayed. Drogheda United enjoys a very good relationship with Sligo Rovers, and our supporters and Sligo's supporters have always been warmly welcomed in each other's grounds.
"It is deeply upsetting that a small minority of hooligans should seek to besmirch the good name of Drogheda United in a matter of minutes.
"We will be working closely with the FAI, Sligo Rovers and with other clubs in the league to ensure that the individuals involved are dealt with in the strongest possible manner. In the case of some of these individuals, the club will be issuing life-time bans."