Arsenal have confirmed that a fan was arrested after red wine was thrown towards the Manchester United bench at the Emirates Stadium on Saturday.
The incident came as the visitors celebrated the opening goal of their 2-1 win and wine reportedly went onto the backs of unhappy United staff on the sidelines.
Arsenal moved to identify the culprit and with the help of CCTV and stewards in attendance, removed him from the stadium.
An Arsenal spokesman said: "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 club."
United are understood to be happy with the way their rivals are handling the flashpoint but have not ruled out making an official complaint.
Former United manager Sir Alex Ferguson has complained in the past about the lack of protection for away teams on the bench at the Emirates.
Ferguson, talking in 2008, said: "It is too open for my liking. It should not happen when you build a modern stadium. You need tin helmets.
"It is a weakness in the planning that you don't provide safety for the visiting substitutes and staff."
The incident came as the visitors celebrated the opening goal of their 2-1 win and wine reportedly went onto the backs of unhappy United staff on the sidelines.
Arsenal moved to identify the culprit and with the help of CCTV and stewards in attendance, removed him from the stadium.
An Arsenal spokesman said: "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 club."
United are understood to be happy with the way their rivals are handling the flashpoint but have not ruled out making an official complaint.
Former United manager Sir Alex Ferguson has complained in the past about the lack of protection for away teams on the bench at the Emirates.
Ferguson, talking in 2008, said: "It is too open for my liking. It should not happen when you build a modern stadium. You need tin helmets.
"It is a weakness in the planning that you don't provide safety for the visiting substitutes and staff."
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