An injured person is assisted after an incident on Westminster Bridge in London, Britain March 22, 2017. REUTERS/Toby MelvilleShow moreShow less
Police officers work at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
Flowers are laid at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
A forensics investigator works at the scene after an attack on Westminster Bridge in London, Britain March 22, 2017. REUTERS/Hannah McKayShow moreShow less
Injured people are assisted after an incident on Westminster Bridge in London, March 22, 2017. REUTERS/Toby MelvilleShow moreShow less
A fire officer works at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
Injured people are assisted after an incident on Westminster Bridge in London. REUTERS/Toby MelvilleShow moreShow less
A forensic investigator works at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
Armed police respond outside Parliament during an incident on Westminster Bridge in London. REUTERS/Stefan WermuthShow moreShow less
A woman ducks under a police tape after an incident on Westminster Bridge in London. REUTERS/Toby MelvilleShow moreShow less
A man lies injured after a shooting incident on Westminster Bridge in London, March 22, 2017. REUTERS/Toby MelvilleShow moreShow less
Police officers work at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
Police officers work at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
An air ambulance lands in Parliament Square during an incident on Westminster Bridge in London. REUTERS/Stefan WermuthShow moreShow less
A woman assists an injured person after an incident on Westminster Bridge in London, March 22, 2017. REUTERS/Toby MelvilleShow moreShow less
Police officers work at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKayShow moreShow less
Forensics investigators work at the scene after an attack on Westminster Bridge in London, Britain March 22, 2017. REUTERS/Hannah McKayShow moreShow less
UK Parliament, Westminster Bridge terror attacks kill five in London