Moment policeman 'kneels on man before punching him' during arrest

The clip was taken in Grosvenor Road, Westcliff, Southend-on-Sea, Essex, on Saturday and widely shared on social media. https://www.dailymail.co.uk/news/article-9405823/Moment-policeman-kneels-mans-punching-him.html?ns_mchannel=rss&ns_campaign=1490&ito=1490