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An ambulance is driven through a police cordon outside the Houses of Parliament in central London on March 22, 2017 during an emergency incident.
Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
An ambulance is driven through a police cordon outside the Houses of Parliament in central London on March 22, 2017 during an emergency incident.
Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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Witness: I saw people on street, mowed down

Radek Sikorski recalls the firearm incident that has occurred near the British Parliament in London, putting the entire Westminster area on lockdown.

Witness: I saw people on street, mowed down

Radek Sikorski recalls the firearm incident that has occurred near the British Parliament in London, putting the entire Westminster area on lockdown.