Two people have been arrested after police were assaulted by away supporters during Aston Villa’s Europa League win over Young Boys at Villa Park.
Supporters of the Swiss side threw items, including broken seats and coins, at Villa players and police officers, with Dutch forward Donyell Malen being struck on the head.
The disorder broke out during the first half of the tie, which Villa won 2-1.
Officers said two away fans were arrested on suspicion of affray and assaulting a police officer.
Superintendent Paul Minor said: "We won't tolerate violence of any kind at football matches.
"The majority of the crowd was in good spirit, but unfortunately, a small minority of away fans caused violence and disrupted the game.
"An investigation has been launched, and officers are reviewing body-worn video and CCTV from the stadium of the disorder."