Three men have been arrested on suspicion of murder after a woman's body was recovered from the Grand Union Canal.
The men, aged 30, 34 and 38 were arrested at separate addresses in northwest London this evening (May 11).
They remain in custody at north London police stations.
The body was discovered in Little Venice on Sunday (May 10). The following day getwestlondon was told that the grim discovery happened near a river boat owned by Richard Branson.
Police say they are "confident" that they know the identity of the woman, but formal identification has yet to take place and next of kin have not yet been informed.
The results of a post-mortem, carried out on Monday (May 11) at Westminster Mortuary, were inconclusive and further tests will now be carried out.
DCI Simon Ashwin, from the Homicide and Major Crime Command, is leading the murder investigation.
He said: "I would like to ask for the help of all those people who use or live on the Grand Union Canal."
"We now believe that the body, placed in a black suitcase, was placed in the Grand Union Canal at some point in the last two weeks," he said. "Whilst the body was recovered near to Little Venice it is highly likely that she entered the water further along the canal."
"Did you see or hear anything suspicious or see a black suitcase in the canal?"
Anyone with information is asked to call the incident room on 020 8785 8244 or call Crimestoppers anonymously on 0800 555 111.