Our officers were called to a trespass incident near Charlton station at 2am on Wednesday 13 August, after reports of a man on the tracks.
Colleagues from the Metropolitan Police Service and London Ambulance Service are also in attendance. The man is currently still on the scene, and specialist officers are talking to him in order to resolve the situation.
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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.