Iran Press/ Europe: A specialist unit was called out after reports of a man seen with a firearm at a bank in the Kensington area of the city shortly after 3:00 pm (1500 GMT).
Some 20 minutes later, the unit stopped a vehicle and shots were fired. Paramedics, including an air ambulance, were called but the man was pronounced dead just before 4:10 pm.
The man, who has yet to be identified, was seen leaving the scene in a vehicle, before being stopped by armed officers 15 minutes later near Kensington Palace.
Road closures were in place in the local area and were likely to remain for some time, with police advising the public to avoid the area.
The incident is not being treated as terrorism.
