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Two sisters who were found stabbed to death in a north London park were killed by a stranger, police have said.
The bodies of Nicole Smallman, 27, and Bibaa Henry, 46, were discovered in Fryent Country Park, Wembley, shortly after 1pm on Sunday.
They had met with friends in the park at around 7pm on Friday to celebrate Ms Henry’s birthday, and had remained in the park together after midnight after others had left.
A post-mortem examination carried out on Tuesday revealed that the pair both died from multiple stab wounds.
Homicide detectives now believe that the pair were murdered by someone who was "unknown to them" between 12.30am and 3am, and have appealed for information about the suspect.
Detective Chief Inspector Simon Harding said: “What we can now say with some certainty is that Nicole and Bibaa were murdered by someone who was unknown to them.
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“We believe the suspect received injuries during the incident which have caused significant bleeding. Do you know anyone who has been wounded in the last week who is unable to account for their injuries?
"Has someone returned home and perhaps acted suspiciously or tried to hide something from you?
“We also believe the suspect left the park via the Valley Drive entrance. Did you see anyone acting suspiciously in that vicinity during the evening of Friday into early hours of Saturday? You may have noticed someone who was injured."
He said officers are "trawling through hundreds of thousands of tonnes of rubbish" from a local refuse depot to find items of relevance to the investigation, which officers believe were "accidentally cleared from the scene when mistaken for rubbish.”
Ms Smallman, who lived in Harrow and Ms Henry, who lived in Brent, were both daughters of former Chelmsford Archdeacon Wilhelmina Smallman, the first woman from a minority ethnic background to hold the title of Archdeacon in the Anglican church.
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Ms Henry was described as a "well liked and highly valued" senior children’s social worker Buckinghamshire council.
Next of kin have been informed and their “devastated” families are being supported by specially trained officers, police said.
DCI Harding continued to appeal for anyone who was in the park on Friday evening through to Sunday lunchtime and saw the group or noticed anything suspicious to come forward, as well as regular park users who might have seen someone acting suspiciously in the days before.
He added: “You may also have stumbled upon items of property, but not realised the significance of them. If you did, you may well have information that could assist us hugely. No matter how insignificant it may seem, please contact us.”
A 36-year-old man was arrested in south London on Wednesday on suspicion of murder. He was taken into custody but released later with no further action, police said.
Anyone with information regarding the incident is asked to call the incident room on 020 8721 4205, via 101 or tweet @MetCC quoting CAD 3160/7Jun.