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
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.
03:56 - Source: CNN
London's month of horror 9 videos
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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Police officers stand on duty at a cordon near the scene in Finsbury Park area of north London after a vehicle hit pedestrians, on June 19, 2017. All the victims of a van attack on worshippers near a north London mosque were Muslim but the man who died at the scene may have been taken ill before it happened, police said on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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Van rams Muslim worshippers in London attack
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Local residents react at the scene in Finsbury Park area of north London after a vehicle hit pedestrians on June 19, 2017.
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Witnesses recount London mosque attack
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How Muslims feel after the Finsbury Park attack
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Police officers on Borough High Street as police are dealing with an incident on London Bridge in London, Saturday, June 3, 2017. Witnesses reported a vehicle hitting pedestrians and injured people on the ground. (Dominic Lipinski/PA via AP)
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London terror attacks: How they unfolded
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Van hits pedestrians near mosque
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LONDON, ENGLAND - JUNE 16: Protesters gather outside of Kensington Town Hall on June 16, 2017 in London, England. 30 people have been confirmed dead and dozens still missing after the 24 storey residential Grenfell Tower block in Latimer Road was engulfed in flames in the early hours of June 14. Emergency services will spend a third day searching through the building for bodies. Police have said that some victims may never be identified. (Photo by Dan Kitwood/Getty Images)
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Angry protests after London fire
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omar al-hajali
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Harrowing tale of brothers separated in fire
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Fire rips through Grenfell Tower as firefighters attempt to control a huge blaze on June 14, 2017 in west London. The massive fire ripped through the 27-storey apartment block in west London in the early hours of Wednesday, trapping residents inside as 200 firefighters battled the blaze. Police and fire services attempted to evacuate the concrete block and said "a number of people are being treated for a range of injuries", including at least two for smoke inhalation. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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Witnesses describe horror of London fire
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