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LONDON, ENGLAND - JUNE 05:  Members of the public gather near flowers on the South side of London Bridge, close to Borough Market in London in tribute to the victims of the June 3 attacks, on June 5, 2017 in London, England. British police on Monday made several arrests in two dawn raids following the June 3 London attacks, claimed by the Islamic State group which left seven people dead.  (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - JUNE 05:  Members of the public gather near flowers on the South side of London Bridge, close to Borough Market in London in tribute to the victims of the June 3 attacks, on June 5, 2017 in London, England. British police on Monday made several arrests in two dawn raids following the June 3 London attacks, claimed by the Islamic State group which left seven people dead.  (Photo by Dan Kitwood/Getty Images)

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    Can the UK do more to tighten security?

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Can the UK do more to tighten security?

Richard Barrett, former head of global counter-terrorism at MI5, talks to Christiane Amanpour about the "absolutely enormous" task facing British intelligence.

Can the UK do more to tighten security?

Richard Barrett, former head of global counter-terrorism at MI5, talks to Christiane Amanpour about the "absolutely enormous" task facing British intelligence.