Manchester United have launched a review into their security protocols after it emerged a pitch invader got into Old Trafford with two toy guns during last month's Champions League game against Juventus.
Shortly after play got under way during the host's 1-0 defeat to the Italian champions, a fan ran across the pitch and was restrained by stewards close to the players.
The Daily Mail reported that security staff later inspected his seat and found two toy guns in a backpack. Manchester United said the safety of fans was an "absolute priority" for the club.
A spokesman added: "Carrying a children's miniature plastic toy gun into a stadium is clearly an extremely irresponsible act.
"Fortunately, the actions of the pitch intruder at the Juventus game did not harm anyone.
"However as the security and safety of all fans and staff is the absolute priority at Manchester United, the club immediately launched an investigation into the circumstances around this issue. This includes a full review of our already-rigorous security protocols, using our own security teams together with external expert consultants."
At the time of the incident, Greater Manchester Police confirmed that one man in his forties was kept in custody overnight, having been arrested on suspicion of pitch invasion.
Uefa has charged Manchester United for the "field invasion". The case will be dealt with by the Uefa Control, Ethics and Disciplinary Body on November 22.
