Aston Villa v Legia Warszawa: Police officers injured after clashes involving fans of Polish team outside Villa Park
Away fans were prevented from entering the stadium after objects were thrown at officers, West Midlands Police say.
Four police officers have been injured and 39 people arrested amid "disgusting and highly dangerous scenes" before Aston Villa's game with Legia Warsaw.
West Midlands Police said fans of the Polish side were not allowed into the stadium after missiles were thrown at officers before the start of the Europa Conference League game on Thursday evening.
The visiting fans were held in the coach park near the ground.
Stewards also removed several people believed to be away supporters from the home stands during the match, while footage on social media appeared to show objects being thrown into the stadium from outside.
Police said in a statement that one of the injured police officers was taken to hospital, while two police horses and two police dogs were also hurt in the "disgusting and highly dangerous scenes".
Chief Inspector Tim Robinson said: "This should have been a great evening of football which was enjoyed by fans from both clubs.
"Unfortunately, there were appalling scenes which saw away fans dangerously throw flares and other missiles at our officers."
West Midlands mayor Andy Street wrote on X, formerly Twitter: "Deeply unpleasant scenes outside Villa Park tonight, which were dealt with absolutely appropriately by West Midlands Police.
"A huge thank you to the brave officers who put themselves in harms way to keep others safe.
"I trust UEFA will now move swiftly to take strong action."
UEFA has said it "strongly condemns the unacceptable violence" which occurred around the match.
"UEFA is in the process of gathering all official reports from the game before deciding on potential next steps," it said in a statement.
In a statement, Legia said their official delegation, owner and president refused to enter Villa Park in solidarity with their supporters, while they also complained about the ticketing situation.
Aston Villa and Legia went into the match neck-and-neck at the top of Group E in the Europa Conference League.
The eight group winners automatically go through to the last 16 of the competition, while the eight runners-up go into a play-off with the third-ranked teams from the Europa League groups.
