Metropolitan Police confirmed 15 arrests had been made outside the ground

FA condemned disorder and will work with police to identify those involved

A group of Millwall fans forced their way into the Barnsley seating area

Barnsley fans had to flee to safety as a group of Millwall supporters attempted to break into the opposing team's end at Wembley.

Millwall fans reacted angrily to their side conceding the third goal in their 3-1 League One playoff final defeat and a mob on the top tier tried to force their way into Barnsley's side. A few made it through the police barrier and their were clashes before they were held back.

The Barnsley supporters - with families amongst them - had to move further around their section to avoid the trouble. But violence still broke out as Millwall fans were captured scrapping and throwing punches.They also threw objects on to rival supporters below.

Some Millwall supporters attempt to get past police barriers and enter the Barnsley seating area at Wembley

A Barnsley supporter is punched in the head towards the end of Sunday's League One play-off final

A bloodied football supporter is restrained by police after crowd trouble breaks out at Wembley on Sunday

At one stage, a Millwall supporter with blood dripping down his face was restrained by a policeman.

On the bottom tier, Millwall fans also began hurling coins towards Barnsley's players on the pitch in an ugly conclusion to the game which saw Barnsley promoted to the Championship. It is believed they were directed at Conor Hourihane and Adam Hammill.

Millwall manager Neil Harris was only made aware of the trouble after the final whistle.

'I hope it wasn't serious and hope everyone gets home safely,' he said. But asked if he condemned the behaviour, Harris replied: 'Next question.'

Millwall supporters attempt to make their way past the barriers and reach Barnsley's seating area

Tykes winger Adam Hammill wheels away to celebrate after scoring his side's second goal against Millwall

The FA condemned the disorder at Wembley and said they will work with police to identify those involved

The FA said on Twitter: 'The FA condemns the disorder caused by a small number of fans at today's League One Play Off final between Barnsley and Millwall.

'We will work closely with the clubs, the Football League and the Met Police to identify those involved and take appropriate action.

'We would like to take this opportunity to praise the actions of our stewards and the police, who responded responsibly under provocation.'

The FA condemns the disorder caused by a small number of fans at today’s League One Play Off final between Barnsley and Millwall . — The FA (@FA) May 29, 2016

We will work closely with the clubs, the Football League and the Met Police to identify those involved and take appropriate action. — The FA (@FA) May 29, 2016

We would like to take this opportunity to praise the actions of our stewards and the police, who responded responsibly under provocation . — The FA (@FA) May 29, 2016

Metropolitan Police later confirmed 15 arrests had been made outside the ground. Enquiries are continuing into matters inside the stadium but no arrests have been made so far.

'At approximately 4.35pm on Sunday, 29 May, during the League One play-off final between Millwall and Barnsley at Wembley, an altercation between a small number of fans occurred,' a statement read.

'No arrests have been made at this stage and enquires continue.'

'The Metropolitan Police Service will conduct a review and will liaise with the Football Association and the two clubs involved to identify those responsible and take appropriate action.'

It added: 'Fifteen people were arrested outside the ground, before and after the game, largely for public order offences.