A woman has died after being hit by debris falling from a building.
The woman, believed to be in her 20s, was pronounced dead at the scene after building work fell on her in Hanover Square in Mayfair, central London, the London Ambulance Service (LAS) said.
An air ambulance was sent and extensive efforts were made to resuscitate the woman to no avail.
An LAS spokeswoman said: "We were called at 11.30am today to reports of building work fallen on a person at Hanover Square.
"Extensive efforts were made to resuscitate a woman, but sadly she was pronounced dead at the scene by the air ambulance doctor."
Police also attended the scene.
A Scotland Yard spokeswoman said: "At this stage it is believed an unknown object hit the woman."