A British Airways engineer has died after two airport vehicles crashed at Heathrow.
A man in his 40s suffered a cardiac arrest and died, despite attempts to save him at the airfield and on the way to hospital.
The Telegraph reports two vehicles collided on the airfield early Wednesday morning at the London worldwide airport's Terminal 5.
A Heathrow spokesman said: "Following an incident on the airfield involving two members of staff, an investigation is underway and we are working with the Police".
"One male is believed to have sustained a broken shoulder; his injuries are not life-threatening or life-changing".
Another man was treated for a shoulder injury by the London Ambulance Service (LAS) and taken to a west London hospital.
The airport said on earlier on Wednesday that it was dealing with a "serious accident" after passengers reported delays.More news: American Shaun White wins halfpipe Olympic gold
The BBC reports passengers on one plane were forced to evacuate after the crash.
"It's a tragic incident and everyone at the airport in a state of shock right now".
The Health and Safety Executive was informed and officers from the Metropolitan Police's serious collision investigation unit went to the scene.
Hundreds of peoples were stuck on planes stalled on the tarmac, as more than 20 flights, mostly out of Terminal 5, were delayed, the Telegraph reported.
London Ambulance Service said the man went into cardiac arrest and efforts were made to resuscitate him both at the airport and on the way to hospital. A post-mortem will be scheduled in due course.
The passengers in the affected plane have since departed on another aircraft, The Observer has been told.
But a spokeswoman for BA said several of its flights from Terminal 5 were delayed by the crash.