Parsons Green Terror Attack - London Mayor Sadiq Khan statement

CLEAN: Shows exterior shots interview soundbite with London Mayor Sadiq Khan speaking on escalation of terror attacks across European Cities and enhanced police presence across London in wake of Parsons Green Terror Attack. Says: "The phrase used by counter terrorism experts a few weeks ago was 'this is not a spike this is a shift'. And we've seen a shift in major cities across Europe, whether it's Barcelona, whether it's Brussels, whether it's Paris, whether it's Rotterdam, whether it's Stockholm, whether it's Manchester. The terrorists have stepped up attempts to kill us, to injure us, to disrupt our way of life. We've got to make sure we're alert, we're vigilant but also that we're calm over the next few hours, the next few days. Londoners will see an enhanced police presence, they will see an increased police presence on our public transport network and across London. We've got to be vigilant, we've got to be alert, we've got to be calm."An extensive manhunt is underway for the perpetrator of a terror attack, as police carry out a major investigation following an explosion on a London tube train during the height of the morning rush hour. Witnesses described scenes of terror and panic as the blast sent a fireball through a District line tube train at Parsons Green Station at 8.20 am on 15th September, 2017 in London, England, UK