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
The city is one of a small number which has seen an increase in traces of the Class A substance over recent years.
A goldfish from Buckinghamshire has survived an operation to remove a tumour. The surgery cost £200, the goldfish cost £3.
Most people woke up today to cold weather with heavy rain and cloudy skies.