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LONDON, ENGLAND - JUNE 03:  Counter-terrorism special forces assemble near the scene of a suspected terrorist attack near London Bridge on June 4, 2017 in London, England. Police responded to what they are calling terrorist attacks on London Bridge and Borough Market where at least 20 people were injured and one person was killed.   (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - JUNE 03:  Counter-terrorism special forces assemble near the scene of a suspected terrorist attack near London Bridge on June 4, 2017 in London, England. Police responded to what they are calling terrorist attacks on London Bridge and Borough Market where at least 20 people were injured and one person was killed.   (Photo by Dan Kitwood/Getty Images)

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How can we better protect against terrorism?

What can be done to better protect against terror attacks? CNN's Clarissa Ward talks to the London Metropolitan Police former chief superintendent for answers.

How can we better protect against terrorism?

What can be done to better protect against terror attacks? CNN's Clarissa Ward talks to the London Metropolitan Police former chief superintendent for answers.