A female athlete from Sierra Leone who had not been seen since finishing this weekend's London Marathon has been found safe and well.
Police said Mami Konneh Lahun, 24, had returned to an address in Greenwich where she had been staying since arriving in the UK last week.
Ms Lahun finished 20th in the race.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.