Hundreds of Isis propaganda videos remain on YouTube, including some that refer to the Westminster attack

Islamic State has flooded YouTube with hundreds of violent recruitment videos since the terrorist attack in London last week in an apparent attempt to capitalise on the tragedy, The Times can reveal.

Google, the owner of YouTube, has failed to block the films, despite dozens being posted under obvious usernames such as “Islamic Caliphate” or “IS Agent”. Many are produced by the media wing of Isis and show, in high definition, beheadings and other extreme violence, including by children.

Several of the videos expressly refer to Wednesday’s attack on parliament by Khalid Masood, the Muslim convert who stabbed a police officer to death after ploughing his car into pedestrians on Westminster Bridge.

“Five kaffir dead in London, thousands of believers dead because of US airstrikes,”