Man shot dead near airport
The incident occurred on the Colnbrook bypass near Bath Road close to the airport at 4.35pm.
According to unconfirmed reports, armed police patrolling the airport exchanged gunfire with the occupants of a car after it failed to stop.
A London ambulance service spokeswoman said they were called at 4.43pm.
They dispatched one road ambulance, a duty officer in a car and the air ambulance.
Security at the airport was stepped up in February amid fears it might become a target for terrorist attacks.
A Scotland Yard spokesman said: “We are dealing with a firearms incident at the moment.”
The man, who was white, was pronounced dead at 5.34pm.
The shooting happened in Saxon Way, a minor road close to the A4.
The incident is not believed to be terrorist-related.
An eyewitness said about 50 police officers and 20 police vehicles were at the scene.
The incident happened near the British Airways training building.