A police officer lays a floral tribute from a member of the public beside a photo of Keith Palmer, the Metropolitan Police constable who was stabbed to death near the Houses of Parliament in London during a terror attack on March 23, 2017.
A police officer lays a floral tribute from a member of the public beside a photo of Keith Palmer, the Metropolitan Police constable who was stabbed to death near the Houses of Parliament in London during a terror attack on March 23, 2017.
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A somber crowd gathers in London's Trafalgar Square at the vigil for the victims of Wednesday's attack.
A somber crowd gathers in London's Trafalgar Square at the vigil for the victims of Wednesday's attack.
Matt Dunham/AP
A woman looks on during the vigil. A message written on her hand reads: "We are not afraid"
A woman looks on during the vigil. A message written on her hand reads: "We are not afraid"
Carl Court/Getty Images
London Mayor Sadiq Khan speaks as UK Home Secretary Amber Rudd and Metropolitan Police Acting Commissioner Craig Mackey look on.
London Mayor Sadiq Khan speaks as UK Home Secretary Amber Rudd and Metropolitan Police Acting Commissioner Craig Mackey look on.
Carl Court/Getty Images
A group of nuns light candles during the Trafalgar Square event.
A group of nuns light candles during the Trafalgar Square event.
Matt Dunham/AP
A letter is left among votive candles during the vigil.
A letter is left among votive candles during the vigil.
Carl Court/Getty Images
A young girl holds a candle during the vigil.
A young girl holds a candle during the vigil.
Jack Taylor/Getty Images
A woman wearing traditional Muslim dress holds up a sign at the vigil.
A woman wearing traditional Muslim dress holds up a sign at the vigil.
Matt Dunham/AP