A helicopter has crashed into a crane in Vauxhall, south London, plummeting into the ground and sending a thick column of smoke into the air.
The crash involved two cars and an unknown number of people, London Fire Service said.
The helicopter is believed to have plummeted straight into the ground just off a main road. Flames and a huge column of black smoke could be seen near the River Thames.
Witnesses said at least six or seven fire engines are at the scene.
A spokesman for London Fire Brigade was unable to give details but said: “We are taking lots of emergency calls at the moment.”
A Met police spokesman said: “We had a call at approximately 8am this morning and we are dealing with an incident.”