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 man in the 40s was killed in southern Poland and a further 33 people injured in Germany.
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The station's decision not to renew the former London mayor's contract follows his controversial comment about Hitler supported Zionism.