Police are to launch a full investigation after violent scenes blighted the final play-off between Motherwell and Rangers.

There was chaos at Fir Park after a mass brawl broke out, resulting in fans invading the pitch.

Rangers substitute Bilel Moshni kicked and punched Motherwell's Lee Erwin after being pushed by the striker.

Other players and officials from the teams then tried to break up the trouble with further scuffles breaking out.

Motherwell fans also ran onto the pitch to celebrate in front of the Rangers support before being cleared by stewards and police.

The brawl on the final whistle resulted in red cards for Mohsni and home duo Erwin and Fraser Kerr.

Earlier in the game Rangers' Lee McCulloch was hit by a flag pole, sparking outrage from supporters.

Video footage of the incident, which happened just before half-time, has been shared thousands of times on social media.

Motherwell won the match 3-0 and the two-leg tie 6-1 on aggregate to maintain their place in the Scottish Premiership and confine Rangers to a second season in the Championship.

Police Scotland last night said it would be launching a "full review" in light of the ugly scenes.

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."

Following the game, Erwin said: "I tried to shake his (Moshni) hand and wish him all the best and he told me to "Eff off".

"I pushed him and he reacted badly. A player at a club like that, at that level, should not be acting like that.

"It's embarrassing for him and the club. I wish him all the best."

Rangers manager Stuart McCall said: "No-one can condone that sort of behaviour. Bilel's contract is up but that's totally unacceptable.

"I don't know if the club can take any action against him but I don't think there is any doubt he won't be at the football club next season."

Motherwell boss Ian Baraclough said he did not see what happened.

He added that he did not want the drama to overshadow the club's victory.

He said: "The game doesn't need that, Scottish football doesn't need that.

"The games were played in a decent spirit regarding what was at stake and to have that at the end has no place in this game.

"We worked so hard to put a game plan in place.

"Hopefully the stuff at the end won't overshadow the win, because it was 10 seconds of madness that has no place in this sport whatsoever."

Rangers fans groups played down the drama, putting it down to the stakes being high.

A spokesman for the Rangers Supporters Trust said it was up to the police to decide on any possible action.

He said: "You're always going to get these flash points in a high pressured game.

"I think with Moshni it looked like the Motherwell player had pushed him first so Moshni shouldn't have done that but he shouldn't be getting pushed either.

"And with Lee McCulloch - it's going to have to be up to the police to decide what happens there.

"I was quite surprised when it happened that police didn't intervene sooner. I didn't see them interview Lee McCulloch straight away.

"At the end of the day these things shouldn't be happening but I think in Scotland we tend to overreact a bit.

"You see flash points in big games all the time, you see players reacting to other players."