Smoke billowing from timber doors welcomed the Minnesota Vikings to the Wembley field ahead of their clash against the Pittsburgh Steelers this evening.
The teams tweeted video and pictures of the atmosphere from the ground before kick off.
Wembley Stadium will tonight host the Minnesota Vikings and Pittsburgh Steelers in the first of two NFL International Series matches to be played in London this year.
The police have released 11 new images of football fans they want to question following violence at Wembley during the FA Cup semi-final between Millwall and Wigan.
The disturbances took place in the Millwall supporter section and 43 people have so far been arrested – this is the third photo appeal.
The release of the new pictures follows dawn police raids last week which resulted in three arrests.
Police said they are investigating incidents involving Millwall supporters at today's FA Cup semi-final that left some fans bloodied and younger ones in tears.
A Scotland Yard spokesman said:
Ten people have been arrested following sporadic disorder among fans in the Millwall supporters' area at Wembley. Investigations into the circumstances of the incidents are continuing.
Millwall football fans fought each other at Wembley as their side lost 2-0 to Wigan in the FA Cup semi-final today.
Police intervened after MIllwall fans fought each other in the stands at Wembley as the London club lost 2-0 to Wigan Athletic in the FA Cup semi-final.
Former Millwall player Paul Ifill said Lions fans who fought each other in the stands during today's FA Cup defeat to Wigan "tainted the day".
Gutted boys had a go 2nd half Wigan 2 gd great cup run now bk 2 the league must stay up! Shame that a few so called fans tainted the day!
Wigan Athletic have reached the FA Cup final for the first time in their history, beating Millwall in a match that was marred by scenes of violence involving fans of the London club.
Shaun Maloney and Callum McManaman scored in a 2-0 win for the Latics, whose victory means the club qualify for Europe.
Millwall fans could be seen fighting each other in the stands throughout the second half of the Wembley semi-final.
Swansea manager Michael Laudrup has spoken of his pride after seeing his side thrash Bradford 5-0 to win the Capital One Cup at Wembley.
Laudrup told Sky Sports 1: "I'm very proud of my team today. I think it was a great performance."
He also hailed the triumph as the best of his managerial career.
As a manager it's absolutely at the top, winning a trophy for the first time in 100 years.
The first trophy is always special, and now next year in Europe... it's a nice experience.