An Agusta 109 helicopter crashed into two cars just off Wandsworth Road near South Lambeth Road and exploded into flames after it smashed into a crane in central London on Wednesday morning at around 8am.
It was on a scheduled commercial flight from Surrey to Elstree, but was diverted to Battersea due to bad weather.
Two people were killed; the pilot and a person on the ground.
Burning wreckage and aviation fuel covered the road at the accident site and debris is scattered over three surrounding buildings.
Witnesses said the helicopter wheeled out of the sky after hitting the crane on St George Wharf Tower, in Vauxhall, in heavy fog.
Thirteen people were injured, with one reported to be in a critical condition.
London Fire Brigade said they had rescued a man from a burning car at the scene, although his condition is not known.