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Police officers escort a person, with their head covered, to a police van, in Barking, east London on June 5, 2017, following a dawn raid on a property (R), as thier investigations continue following the June 3 terror attacks in central London.
Police carried out fresh raids and arrested "a number of people" on Monday after the Islamic State group claimed an attack by three men who mowed down and stabbed revellers in London on June 3, killing seven people, before being shot dead by officers. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Police officers escort a person, with their head covered, to a police van, in Barking, east London on June 5, 2017, following a dawn raid on a property (R), as thier investigations continue following the June 3 terror attacks in central London.
Police carried out fresh raids and arrested "a number of people" on Monday after the Islamic State group claimed an attack by three men who mowed down and stabbed revellers in London on June 3, killing seven people, before being shot dead by officers. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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    London Bridge attacker once appeared in TV doc

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London Bridge attacker once appeared in TV doc

Authorities say one of the terrorists involved in Saturday's London Bridge attack was known to authorities and appeared in a TV doc. CNN's Alex Marquardt reports.

London Bridge attacker once appeared in TV doc

Authorities say one of the terrorists involved in Saturday's London Bridge attack was known to authorities and appeared in a TV doc. CNN's Alex Marquardt reports.