Two people have been taken to hospital after pieces of steel fell 30ft from a crane at the Nine Elms development.
Paramedics, firefighters and police were called to the building site in Ponton Road, Battersea, at about 2pm after what was described as “a quantity of steel” hit two people.
A London Ambulance Service spokeswoman said paramedics were called to reports of a person hit by a falling object at the development and confirmed two people had been taken to hospital.
The spokeswoman said: “We sent multiple resources to the scene, including two ambulance crews, a single responder in a car and an incident response officer, alongside our hazardous area response team and London's Air Ambulance.
“We treated two patients at the scene.
“A man with a head injury was taken as a priority to hospital escorted by the doctor from the air ambulance.
“A woman with a hip injury was also taken to hospital.”
Alister Smith, who lives near to the building site, said he heard a helicopter circling overhead for about 15 minutes before it landed.
He told the Standard: "The next thing I was aware of was paramedics, ambulances and police cars and then the air ambulance landed behind the building.
"There were about four fire engines I noticed as well."
Mr Smith said there was initial speculation that a crane had collapsed at the development.
London Fire Brigade, which said the steel had fallen 30ft, confirmed firefighters were called to the building site but did not need to take any action because no one had been trapped by the falling metal.
