Windows were broken at the house of referee Hugh Dallas after the violent Old Firm clash between Celtic and Rangers.

A spokesman for Strathclyde Police said the referee contacted them after the incident at his home in Carfin near Motherwell, Lanarkshire.

Dallas was in his home around midnight when the attack happened. "We can confirm that a number of windows were smashed at his home," said a police spokesman. "Officers are keeping an eye on it."

The attack on the referee's home is the latest incident in a catalogue of violence surrounding last night's Old Firm clash during which 113 arrests were made as violence flared in and outside Celtic Park.

The game was also marred by pitch invasions and three sendings-off and was followed by violent street clashes between fans and police.

The Motherwell official suffered a head wound moments before half-time in the hostile League meeting at Parkhead last night after being struck by a missile thrown from the stand.

Dallas required on-pitch treatment from Celtic physio Brian Scott to treat his injury which needed four stitches at the interval of a game Rangers won 3-0 to seal the Scottish title.

That followed the FIFA official, who was Scotland's representative at France 98 and is well-respected in world football, sending off Celtic defender Stephane Mahe.

During the game he also sent off Rangers' Rod Wallace and Celtic's Vidar Riseth and awarded a controversial penalty to the visitors.

In a five-minute period approaching the break, several home fans ran on to the pitch in apparent attempts to attack the referee with one only blocked from doing so by the Celtic players.

Dallas yesterday claimed the fixture was "the hardest game" he has ever had to referee.

But he will remain in charge of the Old Firm Scottish Cup final on May 29th although he is now certain to be the focus of intense attention in the build-up to that game.

Scottish Football Association spokesman Andy Mitchell said yesterday that reviewing Dallas' position was not a matter for discussion.

He added: "There is no suggestion Hugh Dallas won't still be refereeing the Tennents Scottish Cup final.

"His display was magnificent last night and proved that he is one of the top referees operating in Europe."

Dallas was adamant yesterday his only concern was getting the game over and done with. "It was the hardest game I have ever had to referee. It was pretty hairy stuff. When we actually came out the wall of noise at Celtic Park was deafening; you couldn't actually hear each other talk."

Dallas said he had been ready to tackle the first fan who ran on the pitch. "My first reaction was that the spectator was going to get to me because there wasn't anybody between him and myself.

"All of a sudden I decided I had to stop this guy, and thankfully one or two of the Celtic players appeared from nowhere. It's still blurred in my mind what actually happened. But I saw the Celtic players grab him on the ground, and then the security guys got to me."