Whitehall arrest: Aerial video of forensics at workThis video can not be playedTo play this video you need to enable JavaScript in your browser.Whitehall arrest: Aerial video of forensics at workCloseA bag and what appear to be a number of knives can be seen lying on the ground.SubsectionUK PoliticsPublished27 April 2017Shareclose panelShare pageCopy linkAbout sharingRead description