Firefighters were called to the Euston Road underpass this afternoon (Tuesday) after four cars were involved in a collision.
One of them had turned over on its side but thankfully no one was trapped in any of the vehicles.
Two men, one woman and a child were treated at the scene by London Ambulance Service before being taken to hospital.
The crash temporarily closed the Euston Road underpass in both directions.
The Brigade was called at 1632 and the incident was over by 1712. Three fire engines, a rescue unit and 21 firefighters and officers attended the crash.
Crews from Soho, West Hampstead and Euston fire stations were at the scene.