PRESIDENT George W. Bush's three hour visit to Northern Ireland last month cost local taxpayers more than $600,000 in policing costs, it has emerged.Last month the outgoing president paid a flying visit to Northern Ireland during which he held an hour of talks at Stormont with First Minister Peter Robinson and Deputy First Minister Martin McGuinness.He also visited a school on the outskirts of Belfast, where he took part in a basketball game with Protestant and Catholic children.Up to 250 protesters turned up in the center of Belfast to demonstrate against Bush's visit.Despite the fact that the president did not travel within five miles of the picket, police had to close roads around Belfast City Hall for a number of hours.