Police in Scotland are set to launch an investigation into the shameful scenes which marred Motherwell's Scottish Premiership play-off final win over Rangers at Fir Park on Sunday.

After winning 3-1 in the first leg at Ibrox, Motherwell won the return 3-0 thanks to Marvin Johnson's deflected second-half goal, a Lionel Ainsworth strike and a John Sutton penalty in stoppage time to triumph 6-1 on aggregate and maintain their top-flight status.

However, there were ugly scenes at the final whistle when Rangers substitute Bilel Mohsni kicked and then punched Lee Erwin after being pushed by the Motherwell player following the Tunisian's refusal to shake his hand.

This sparked a mass brawl, prompting home supporters to flood onto the pitch to goad the Rangers players and supporters as police and stewards struggled to maintain control of the crowd.

In response to the disturbance Assistant Chief Constable Bernard Higgins said: "Police Scotland will conduct a full review of the circumstances and liaise with the appropriate partners, and decide how best to take the matter forward over the coming days."

It was confirmed later that Mohsni, Erwin and Motherwell's unused substitute Fraser Kerr were all shown red cards by referee Craig Thomson for their parts in the incident.

Rangers manager Stuart McCall said he had not seen the incident but confirmed the Tunisian had played his last game for the Ibrox club.

"If he has thrown a punch that's disgraceful," McCall added. "But it's safe to say he won't be at the club next season. He's out of contract."

Motherwell manager Ian Baraclough added: "I was trying to talk to Stuart McCall and then all of a sudden I saw the melee so I don't know what kicked it off.

"Lee went to shake hands and I don't know what happened exactly. There has been an outpouring of emotions and it's gone too far.

"There were some unsavoury scenes and there is no place in football for that. You battle hard on the pitch and after the 90 minutes you shake hands and move on, and it was disappointing to see that."