Rangers drew level with Celtic in second place in the Scottish Premiership as Youssef Chermiti's second-half double and Mikey Moore's clincher gave Danny Rohl's side an incredible comeback win.

Yang Hyun-Jun's thumping finish was scant reward for Celtic's dynamic first-half display but the script flipped entirely as Rangers seized on their opportunity and the hosts' defensive fragility.

As events unfolded, a furious response from Celtic supporters emerged as they targeted the board, with ugly scenes in the stands as matters on the pitch increasingly became a side show.

It's now six defeats in eight outings for under-siege manager Wilfried Nancy, who watched on as defensive frailty once again cost his side after initial promise evaporated.

For Rangers, eight points adrift of the champions when Rohl took charge, they are now firmly in the fight for the Premiership title after a stunning victory.

The stakes were incredibly high, with Rangers looking to claw their way back into the title race and, incredibly, level on points with Celtic. Given their start to this campaign that seemed unimaginable not long ago.

Nancy simply needed something to go right in a game of such importance. Yet again, a nightmare unfolded for the Frenchman.

However, on the evidence of the first half, Celtic should have won this comfortably.

Yang's finish was superb, arrowing straight into the corner from a tight angle as the home side went for the jugular.

The South Korean looked inspired in the opening 45. Yet it was the complete opposite come full-time like every one of his team-mates.

Chance after chance arrived. Auston Trusty somehow missed a free header. Johnny Kenny was wasteful. Jack Butland stood defiant as Rangers were rocking.

Celtic failed to extend that lead and they were punished in full when Nicolas Raskin dribbled untouched past Trusty to the byeline and Chermiti tapped home from close range.

It got better for Rangers so easily. Chermiti surged into space down the left, Trusty decided not to close him down and the striker gratefully found the far corner.

Much-maligned since his arrival, the big-money striker repaid a big chunk here.

Rangers clearly sensed another would end the contest and Moore delivered with a fine finish.

That sparked furious scenes in the stands as Rangers fans rejoiced in the corner. A statement win for Rohl and, perhaps, a statement defeat for Nancy.

Nancy needed a statement win. A statement performance. He got the second part. Unfortunately, for him, only for 45 minutes before everything disintegrated.

As good as Celtic were in the first half, they were as bad in the second.

The manager's record of six defeats from eight leaves Celtic in crisis. Where they go from here is unclear.

The crowd, who were lapping up the first-half display, completely turned.

The board were met with anger as events unfolded. Is this recoverable? Yes, if results follow but there's little to suggest that is coming.

This match encapsulated much of their seemingly self-inflicted issues.

From a position of strength they have made so many errors. They did that in this defeat and Rangers seized on their chance.

Rohl said pre-match that his side were ready for this. They didn't seem so initially but when their chance came they were more than up to the challenge.

Their manager has prudently worked with this squad and now they are firmly in this title race.

With Celtic in freefall, Rangers now have all the momentum to go and chase down Hearts.

They deserve enormous credit for that and showed in this massive victory many of the elements required to challenge for the title.

Celtic manager Wilfried Nancy tells BBC Scotland: "It was disappointing because we deserved more today but again we needed more goals. The first half was outstanding, the intensity, the pressure, the commitment to compete but it was only 1-0. In the second half we conceded three goals from throw ins. It's difficult to accept but it's reality.

"This is not about the players or the tactics, this is about moments. In a few moments we could have done better. My players were outstanding in the first half, they wanted to do better in the second half but the way we conceded, we have to be better.

Rangers manager Danny Rohl: "I give big respect to my team. In the first half, we tried something, but they were better.

"We should enjoy this, but tomorrow but we have to be ready again for the next game. This is a demanding league.

"My players did really well today. It is a statement. It's a massive three points, but now it's about continuing our way and there's also a good feeling to have three wins in a row now."

Celtic host Dundee United in the Scottish Premiership on Saturday, 10th January (15:00 GMT).

Rangers face back-to-back fixtures against Aberdeen with the first of those at home on Tuesday, 6th January (20:00).