A sickeningly anti-Semetic song was attached to a number of videos that went viral on the mobile app TikTok.

The collection of videos had been viewed over 6.5 million times before it was pulled down by TikTok.

The song, which has been circulating since Sunday, included lyrics saying ‘we’re going on a trip to a place called Auschwitz, it’s shower time.’

More than a million people died at Auschwitz during World War Two. The most common form of execution was through gas chambers designed as communal showers.

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Uncovered by the BBC, the first video that used the song showed a giant robot scorpion with a swastika on it attacking people.

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Another video showed a clip from a shooter-style video game of people being killed by green gas.

Michael Priem, chief executive of Modern Impact, told the BBC: ‘TikTok is not revealing their algorithms or strategy behind content. But it’s widely believed that it’s similar to other commonly used models that collect data on our content consumption and peers influenced network.

‘As specific videos gain momentum the algorithm then promotes them more widely across the platform. Hence the users intuitively asking each other to ‘help this go viral’. The problems rest then on the content filtering.’

The videos were live on the social network for three days before they were flagged and pulled down.