Det Ch Supt John Carnochan, head of the Violence Reduction Unit based at Strathclyde Police, told the BBC Scotland news website he had concerns about the event.

He said: "While I do not claim to have a clear understanding of what is involved in cage fighting, I do know there is a fine line between what some people would describe as sport and others would describe as violence.

"The idea that people are prepared to pay to see this kind of activity is concerning.

"More concerning is why any parent would take their child to witness such a thing."