The South African Referee's Association will submit a complaint to SA Rugby concerning an incident in which Willie Roos, the referee in the Currie Cup match between Griquas and the Blue Bulls, had alcohol thrown in his face.

The incident took place mere weeks after incidents of violence during rugby club matches in Johannesburg and the Southern Cape, as well as at a school match in Roodepoort.

André Watson, South African manager of referees, said urgent action will be taken with regard to the alcohol throwing incident in Kimberley, since "incidents like these are detrimental to rugby and create a negative image".

The Blue Bulls won Saturday's match 25-24 in the dying seconds, handing Griquas their first Currie Cup defeat of the season.

However, an outraged spectator was unhappy about the two yellow cards Roos handed out to Griquas' Jonathan Mokuena (captain and No 8) and Rohan Kitshoff (flank).

After the match, the unnamed spectator threw brandy and Coke in Roos's face when he walked off the field.

The two yellow cards left the home team, who were leading 24-18 at that stage, with only 13 players and changed the complexion of the match. Blue Bulls replacement loose forward Pedrie Wannenburg scored the winning try during this period. Roos had warned the Griquas players on several occasions before handing out the yellow cards.

The outraged spectator had also wanted to storm the field, but was caught in time and restrained by stadium staff.

Afterwards he disappeared among the hundreds of spectators.

Watson said the complaint will be submitted to SA Rugby's legal department on Monday. "Reports will be requested from the referee, assistant referees and all officials. The union and the relevant security company will also have to submit reports about the incident.

"We hope to have the matter settled by Thursday."

In the past month in Johannesburg a match between clubs Wanderers and Eldorains had to be stopped after players allegedly pulled out knives and threatened to kill each other.

Following that incident, Heidelberg club in the Southern Cape were suspended for 15 years after the club was found guilty of its supporters attacking players from the Mossel Bay club during a match between the two teams.

In a final act of violence in the past few weeks, an assault charge was laid against former Springbok flank Ian McDonald. He had apparently punched a linesman with his fists during a school match in Roodepoort.

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