The referee at the Old Firm football match between Celtic and Rangers has been injured, apparently by a missile thrown onto the pitch after he sent off a Celtic player.

Celtic press officer Peter McLean: "We are very disappointed" (BBC Radio 5 Live)

Hugh Dallas was treated for a gash on his forehead shortly after a spectator came onto the pitch at Celtic Park.

He had dismissed the home team's French defender Stephane Mahe on 31 minutes, shortly before the incident which occurred as Rangers waited to take a free kick just over five minutes before half-time.

Rangers, who could win the league title with a victory in the game, were already a goal up thanks to Neil McCann.

Call for action

Mr Dallas had blood wiped from his head, but within a minute of restarting the game he gave Rangers a penalty.

Jorg Albertz coverted the kick before another fan came onto the pitch and stewards began to circle the crowd.

Rangers went on to win 3-0 and wrestle the championship back off their rivals in a bad tempered game in which three Celtic players and one from Rangers were sent off.

Celtic have confirmed through a statement made by their press officer Peter McLean, that the four spectators that ran onto the pitch will be barred from Parkhead for life and will also face police charges.

One Celtic fan watching the match demanded action against whoever had inflicted the injury.

"The club need to root out the person responsible because it could cost them a place in Europe and a huge fine," he said.

"Once again it will be Celtic's name being dragged through the dirt."