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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A police officer has suffered potentially life threatening injuries after being assaulted in Doncaster.
Eight cases of fraud and four possible thefts are being investigated, Scotland Yard said.
The US president is set to call on leaders to rally together in the face of threats from North Korea and Iran at the UN General Assembly.