A helicopter and two cars have been involved in this morning's crash in Vauxhall, south London, a spokesman for London Fire Brigade has confirmed to ITV News.
He said an unknown number of people are involved in the collision, which is believed to have occurred close to South Lambeth Road.
The spokesman said 22 different fire and rescue resources are involved as part of a "large response".
Two men were killed after a helicopter collided with a high-rise crane in London and plunged more than 700 ft to the streets below.
The pilot of the helicopter which crashed had thousands of hours of flying experience including for films such as Die Another Day.