The officers were investigating a suspected burglary in Camberwell at the time of the shooting.
- Police say they are looking for a black man in his 20s
- He was wearing a blue puffa jacket and blue jeans
- A white man, also in his 20s, was with him
- The shooting happened in Knatchbull Road - closures are still in place
More top news
The twins cubs, which were born in June, have been named Bert and Ernie after characters from Sesame Street.
The two victims died from their injuries in hospital after the explosion in Hertfordshire.
Investigations are continuing into the cause of the crash in chigwell which killed both people on board.