The Metropolitian Police officer found dead at an address in Camden was a police constable in the Specialist Protection Command.
The investigation into his death will look at whether a Met Police firearm was involved, police have announced.
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The mum wrote the emotional letter after her eight-year-old with Down's syndrome was the only child in his class not invited to a party.
More than 1,800 litter pickers will clear an estimated 57 tonnes of reusable items and half a million sacks of rubbish.
Time for Project Let's-Make-the-Best-of-it.