UEFA said in a statement it appointed an “Ethics and Disciplinary Inspector” to investigate “potential discriminatory incidents” which allegedly occurred during the group stage match on Thursday.

The Youth Forum of the German-Israeli Society accused some Union Berlin fans of anti-Semitism at the game, saying on Twitter: “In the mixed block, we were threatened by Union fans, pelted with beer and insulted as ‘shitty Jews’.”

They said a Union fan tried to set an Israeli flag belonging to a female spectator on fire, and added that other Union fans spoke out against the anti-Semitic behaviour.

On Saturday, Union Berlin said it was working with police to investigate the anti-Semitism accusations and that images and other sources were being used for identification of those allegedly involved.

Berlin police said three incidents were under investigation. The man who tried to set fire to the flag evaded arrest despite being observed by a plain-clothes police officer.

Another man was detained for shouting “Sieg Heil” several times and is set to be charged.

It was the first ever appearance of an Israeli football team in Berlin’s Olympic Stadium, which was built by the Nazis.

Union are not allowed to play European home games in their own stadium because of UEFA regulations on spectator capacity.

A group of 45 registered Union Berlin fan clubs condemned the incidents in a letter to both football teams’ management.