British police are working with the Football Association to investigate a video that has surfaced online apparently showing England fans at the World Cup in Russia performing Nazi salutes.

The video shows two fans performing a Nazi salute and singing a fascist chant while in a bar. The establishment closely resembles one in Volgograd, where England played Tunisia on Monday.

England fans had previously been warned not to hang St George’s flags on monuments in the city – formerly known as Stalingrad – and to be respectful of the fact that it is the site of one of the most brutal battles of the second world war.

Deputy chief constable Mark Roberts, the head of British football policing, presides over a team of spotters who are charged with identifying problematic and criminal behaviour by travelling fans. The spotters are aware of the bar where the video is thought to have been filmed and are investigating. One of the fans in the video was seen on the streets of Volgograd before the game looking inebriated.

An FA spokesperson said: “We strongly condemn the actions of the people in this video. We are working with the relevant authorities, including the UK police investigations team, who are making inquiries to identify the individuals involved and take appropriate action. The disgraceful conduct of the individuals in this video does not represent the values of the majority of English football fans supporting the team in Russia.”

The bar in the video appeared similar to one in Volgograd called Gallery Pub, which had hosted England fans on the evening of the match according to photographs posted on social media. The placement of furniture, televisions, menu items, and scarves and flags around the bar, including a local FC Rotor scarf over a plasma screen, matched the video with the British fans singing.

“And now the fiery British are with us! The entire pub is shaking from their singing!” an account tied to the pub posted on Instagram, alongside a photograph of British and Russian fans.

A person who answered the phone at the pub hung up twice on a reporter from the Guardian when asked about whether the incident had taken place there.

“This type of behaviour shows absolute ignorance of history, is insensitive and can be prosecuted under Russian law,” said Piara Powar, head of Fare, which monitors far-right and discriminatory behaviour in football.

The overwhelming atmosphere in Volgograd was one of good-natured mingling, with most England fans praising the friendliness of their hosts and reporting that Russians had gone out of their way to show them around the city, and provide help and advice.

Equally, there was a sense that the travelling support was being careful not to behave antagonistically. On the morning of the match, Greg Clarke, the chairman of the FA, and the deputy British ambassador to Russia joined fans in a wreath-laying ceremony at Volgograd’s main war memorial.

In the early hours of Tuesday morning in an English pub in central Volgograd, a Guardian reporter heard three young Russian men sing a chant involving the words “Hitlerjugend SS”, apparently a common chant among far-right football supporters in Russia and Ukraine. Elsewhere in the pub, England and Tunisia fans were drinking together with locals amid a party atmosphere.