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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)
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)

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    U.K. terror ringleader investigated before attack

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U.K. terror ringleader investigated before attack

U.K. authorities say the ringleader of the London attacks was intensely investigated before Saturday's rampage. CNN's Alex Marquardt reports.

U.K. terror ringleader investigated before attack

U.K. authorities say the ringleader of the London attacks was intensely investigated before Saturday's rampage. CNN's Alex Marquardt reports.