Authorities failed to help keep public safe from terrorist Usman Khan â victimâs father The Fishmongersâ Hall attack is one of a number of terrorist atrocities where the perpetrator was known to security services Updated The video will auto-play soon8Cancel Play now Sign up to the Hull Live newsletter for daily updates and breaking newsInvalid EmailSomething went wrong, please try again later. Sign up here! When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice