Rangers and Celtic fans clash following dramatic penalty shootout

 Celtic defeated Rangers 4-2 in a penalty shootout after a goalless draw to advance to the Scottish Gas Scottish Cup semi-finals.

The match, the first Old Firm derby in ten years to allow a substantial number of away supporters, with Celtic having approximately 8,000 fans present, was marred by post-game scenes as fans from both clubs invaded the pitch and threw flares and projectiles at each other.

Police and stewards intervened to separate supporters, forming a barricade to control the situation.

The Scottish FA has launched an immediate investigation into the pitch invasion, condemning the behaviour of supporters.

Rangers had a goal disallowed by VAR for handball while Celtic's Daizen Maeda also had a goal ruled out for offside by VAR.