A Metropolitan Police spokesman added that at this early stage, it is believed the police vehicle had its 'blues and twos' in operation at the time of the collision.
The aftermath of the accident was posted on twitter by several eyewitnesses.
Two people had to be cut out of this car after it crashed with a police van in Bermondsey today. http://t.co/O28MuOrCdd
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.