TOPSHOT - A photograph taken on a mobile phone shows British police cars blocking the entrance to London Bridge, in central London on June 3, 2017, following an incident on the bridge. 
Police are dealing with a 'major incident' on London Bridge, Transport for London said on Saturday, after witnesses reported seeing a van mounting the pavement and hitting pedestrians. / AFP PHOTO / Daniel SORABJI        (Photo credit should read DANIEL SORABJI/AFP/Getty Images)