Tinie Tempah and Gene Simmons were among the acts to perform in the lead up to the Minnesota Vikings' match against the Pittsburgh Steelers tonight at Wembley Stadium.
The Kiss bassist sung 'The Star-Spangled Banner' to a packed crowd prior to kick off.
More top news
A second police officer has died after he and a colleague were shot as they scuffled with a suspect in Florida.
Thousands of demonstrators have marched through Boston in opposition to a right-wing rally in the city which was eventually cut short.
Some 1,000 counter-protesters blocked 500 neo-Nazi demonstrators as they tried to march to the site of the death of Hitler ally Rudolf Hess.