A man has died after two vehicles crashed on the airfield at Heathrow Airport.
It has been reported that some passengers were ordered to leave planes.
It says two men were treated for injuries.
The airport hasn't yet released further details of the accident, but a spokesman said it didn't involve any aircraft. We await formal identification.
"One male, is believed to have sustained a broken shoulder; his injuries are not life-threatening or life-changing", the Metropolitan Police said in a statement.
Passengers on one plane had to disembark after the crash, a Heathrow spokeswoman said.
"The second later went into cardiac arrest and extensive efforts were made to resuscitate him both at the scene and on the way to hospital".
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"Officers from the Serious Collision Investigation Unit have been informed and are in attendance". Officers attended with London Ambulance Service colleagues.
A post-mortem will be scheduled in due course.
The Health and Safety Executive has been informed and there have been no arrests, the Met Police said.
"Our deepest condolences go to the family and friends affected by this accident".
More than 30 flights have been delayed this morning, the majority from Terminal 5, with some held back by more than two hours.
Heathrow had tweeted earlier that the collision was "not expected to cause any impact on journeys today". British Airways confirmed that "inaccessible stands" were causing delays to departures.
A spokesman for the airport added: "The airfield remains open and we will work to minimise disruption to our passengers' journeys".