A man has died after two men were pulled from the River Thames.
Police were called at 12. 35 pm on Monday to Kew Bridge Road in south-west London, Scotland Yard said.
Officers, London Ambulance Service and the RNLI attended the scene where two men were found in the water.
The Metropolitan Police said both were pulled from the river and one was pronounced dead at the scene.
The other was taken to a west London hospital and police said they are awaiting an update on his condition.
There are no further details about them at this stage.
A spokeswoman for the RNLI said: “At 12. 30 pm the Coastguard was alerted to an incident on the Thames.
“Chiswick Lifeboat was tasked and responded immediately, as did London Ambulance Service, and two people were brought back to Chiswick Pier and handed to the care of the London Ambulance Service.”
Pictures posted on Twitter by Richmond Police show a number of police cars and two fir e engines.
London Fire Brigade confirmed they attended the scene.
A London Ambulance Service spokesman said: “We were called at 12. 37 pm today to reports of an incident on Corney Reach Way, Chiswick.
“We sent two ambulance crews, an incident response officer, two medics in cars and an advanced paramedic to the scene. We also dispatched our hazardous area response team and London’s Air Ambulance.
“We treated two men at the scene. Sadly, despite the efforts of medics, a man died at the scene.
“We took the second man to a major trauma center as a priority.”
A witness, who did not want to be named, said he saw the pair sitting on the edge of Kew Bridge before they entered the water.
Another man, who also did not want to be named, said he saw them swimming.
One “tried to get to the side”, he said, while the other swam downstream.