Arsenal have confirmed that a fan was arrested after throwing an object towards Manchester United's bench after the visitors' opening goal at the Emirates Stadium on Saturday.

United moved back into the top four following a 2-1 win in North London, as Kieran Gibbs scored an own goal before Wayne Rooney put the game beyond the Gunners, despite Olivier Giroud's late strike.

Arsenal have promised stiff action against the fan if he is found guilty.

An Arsenal spokesman told Press Association Sport: "A male was arrested at the stadium for throwing an object towards the Manchester United bench after the first Manchester United goal.

"There will be full co-operation between Arsenal and the Met Police - we do not tolerate anti-social behaviour. If found guilty, individual will also be banned by [the] club."