Warning: Contains strong and extremely offensive language

You need to install or upgrade Flash Player to view this content, install or upgrade by clicking here.

A woman who racially abused tram passengers on a packed south London route has allegedly been arrested. The incident was caught on a mobile phone by a passenger and uploaded to YouTube on Sunday.

At the time of writing it already had over 125,000 views and over 20,000 comments. About 500 comments were being added every three or four minutes.

British Transport Police said a 34-year-old woman had been arrested on suspicion of a racially-aggravated offence but haven’t clarified exactly where or when the incident happened.

In the video the woman with a child on her lap, says

What has this country come to? A load of black people and a load of f***ing Polish? You ain’t English. You ain’t English either. None of you are f***ing English. Get back to your own… D’you know what? Sort out your own countries, don’t come and do mine. Britain is nothing now. Britain’s f*** all. It’s all black and f***ing brown people

Go back to Nigger-agua!

She is told to ‘stop swearing in front of kids’ by a passenger, but continues to swear and carries on with her racist rant.

A British Transport Police spokesman said

The video posted on YouTube and Twitter has been brought to our attention and our officers have launched an investigation. As a result, we need anyone who witnessed this incident, or with any information that could assist our investigation – including the identity of the woman – to contact us. We will not tolerate racism in any form on the rail network and will do everything in our power to locate the person responsible