Both winning tickets in the St Valentine's Day Lotto jackpot were sold in the same area but on opposite sides of the Border. Each ticket was worth £801,349.
One was bought by a man from Strabane, Co Tyrone, who wishes to remain anonymous. The other winner is the Brown Road Syndicate of Lifford, Co Donegal.
The syndicate members are Ms Sally Maguire (62), a publican, Mr Roger McGonagle and Mr Columba McHugh, both unemployed, and Mr Thomas Patton, who has a window making business.