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LONDON, ENGLAND - MARCH 23:  Flowers are left with a memorial to Police Constable Keith Palmer who was stabbed as he tried to stop an attacker in a courtyard outside the Houses of Parliament yesterday, on March 23, 2017 in London, England. Four people including the assailant have been killed and around 40 people injured following yesterday's attack by the Houses of Parliament in Westminster.  (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - MARCH 23:  Flowers are left with a memorial to Police Constable Keith Palmer who was stabbed as he tried to stop an attacker in a courtyard outside the Houses of Parliament yesterday, on March 23, 2017 in London, England. Four people including the assailant have been killed and around 40 people injured following yesterday's attack by the Houses of Parliament in Westminster.  (Photo by Carl Court/Getty Images)

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    Man tells of PC Palmer's final moments

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Man tells of PC Palmer's final moments

Captain Mike Crofts gives an emotional interview on the "BBC Breakfast" show, recounting the last moments of Keith Palmer who died in the London terror attack.

Man tells of PC Palmer's final moments

Captain Mike Crofts gives an emotional interview on the "BBC Breakfast" show, recounting the last moments of Keith Palmer who died in the London terror attack.