A 19-year-old man is in a critical condition in hospital after being stabbed in New Cross.
Police say it happened on New Cross Road, near the junction with Clifton Rise, at around 3:30am.
Police say it is not connected to the earlier stabbing of a 14-year-old boy in Lee.
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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.