The meeting was scheduled to discuss operational arrangements for the council’s new £35m leisure centre.
A woman and two men were inside the house at the time but there are no reports of any injuries.
Banbridge beat Annadale to win the men’s Kirk Cup final while Pegasus lift the women’s Ulster Shield with victory over Belfast Harlequins.
The woman was hit twice by a man who tried to take her handbag on Scarva Street in Banbridge.
A late Eugene Magee goal gives Banbridge a 4-3 win over Three Rock Rovers in the opening round of fixtures of the Irish Hockey League.