Eyewitness Paul Robinson witnessed the incident yesterday in Central London when a helicopter collided with a high rise crane.
He said he was 'shook up' and his first reaction was to run away from the scene.
Two crane drivers told the Daily Mail that they were lucky to be alive after over sleeping, and missing the crash.
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.