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Ambulances wait as members of the emergency services work on Westminster Bridge, alongside the Houses of Parliament in central London on March 22, 2017, during an emergency incident.
British police shot a suspected attacker outside the Houses of Parliament in London on Wednesday after an officer was stabbed in what police said was a "terrorist" incident. One woman has died and others have "catastrophic" injuries following a suspected terror attack outside the British parliament, local media reported on Wednesday citing a junior doctor. / AFP PHOTO / NIKLAS HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
Ambulances wait as members of the emergency services work on Westminster Bridge, alongside the Houses of Parliament in central London on March 22, 2017, during an emergency incident.
British police shot a suspected attacker outside the Houses of Parliament in London on Wednesday after an officer was stabbed in what police said was a "terrorist" incident. One woman has died and others have "catastrophic" injuries following a suspected terror attack outside the British parliament, local media reported on Wednesday citing a junior doctor. / AFP PHOTO / NIKLAS HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)

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Police: 7 arrests in London attack

New Scotland Yard Head of Counter Terrorism Mark Rowley gives an update on the facts in the ongoing investigation into Wednesday's vehicle and knife attack in London.

Police: 7 arrests in London attack

New Scotland Yard Head of Counter Terrorism Mark Rowley gives an update on the facts in the ongoing investigation into Wednesday's vehicle and knife attack in London.