Police have identified a 27-year-old woman who was found stabbed to death at her home in central London.
Kamonnan Thiamphanit, who was known as Angela, was found by officers in Stanhope Place, Westminster, on Monday.
So far there have been no arrests.
The Metropolitan Police has referred itself to the Independent Office for Police Conduct (IOPC) over its handling of the investigation. The force said the victim’s friends contacted officers on Sunday concerned for her welfare.
Officers forced entry and said they found her dead with “a number of stab injuries”.
A post-mortem investigation found the cause of death was “sharp force trauma”.
The Met said it received a call “raising concerns for the welfare of the woman” at 19:05 BST on Sunday and then another from the same person at 21:34.
“The woman was initially graded as a medium risk missing person prior to the discovery of her body,” the force said.
The Met said it had informed its own Directorate of Professional Standards and a “mandatory referral will be made to the IOPC in relation to the initial contact from the woman’s friend”.
Det Ch Insp Adam Clifton said: “My team continues to work tirelessly to piece together the events that led to Kamonnan’s murder. I would like to thank local residents for their patience while we have gone about our work at the scene.
“I would appeal to anyone who has information that could assist us, no matter how insignificant you think that may be, to come forward and speak to us.
“Kamonnan’s family and friends have been devastated by this murder and we must ensure whoever is responsible is held to account.”
He appealed for people to check doorbell cameras and dashcam footage.
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