Detectives in Greenwich have arrested a 53-year-old woman in Deptford in connection with an incident in Eltham High Street on Thursday 13th September where a baby was given an unknown substance.
She remains in custody at a south London police station.
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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.