We were called at just before 12.20pm to reports of a road traffic collision on Warren Lane, Harrow.
We sent two ambulance crews, two single responders in cars, a duty officer and London's Air Ambulance to the scene.
Sadly one patient was dead at the scene.
Our staff treated one patient for chest injuries who was taken to the Royal London hospital and another patient was treated for minor injuries and taken to Northwick Park hospital.
More top news
Patricia Al from ran up the monster debt after using her O2 mobile in Turkey.
The position, posted on the British Monarchy website, pays £16,000 a year for 20 hours a week.
Police are hunting for a passenger seen on CCTV after a 15-year-old boy was attacked and left with a punctured lung.