SCOTLAND’S First Minister John Swinney vowed to work with Rangers, Celtic and the football authorities to address the trouble that followed Sunday’s Scottish Cup tie.Supporters clashed on the Ibrox pitch after Celtic knocked Rangers out on penalties.About 200 Rangers fans charged towards the Broomloan Stand housing the visiting fans after dozens of them had spilled on to the pitch to celebrate as Tomas Cvancara sealed a shoot-out win.Police and stewards formed a barrier but missiles, including a lit flare, were thrown and there were some isolated skirmishes.