Two men who were found in a car after they were stabbed to death have been named as Aaron Carriere and Josiah Manful.
No one has been arrested and police are appealing for witnesses to come forward. Any one with information can call the incident room on 020 8345 3715 or Crimestoppers anonymously on 0800 555 111.
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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.