Police in north London say they are tracing rough sleepers in connection with the murder of an 80-year-old woman at an allotment.
Lea Adri-Soejoko was found dead in a lock-up store at the site in Colindale in the early hours of Tuesday.
The pensioner was the secretary of the Colindale Allotment and Garden Association and was reported missing after she failed to attend a gardening meeting in Barnet.
Her body was found half an hour later.
Police are looking into reports of previous crime in the area and are trying to identify people who "may have been rough sleeping in and around that area at certain times".
Detective Chief Inspector Noel McHugh said: "We would like to establish who those individuals are and account for them."
Officers are also trying to account for everyone who was in the allotments in Sheaveshill Avenue between Sunday evening and Tuesday morning.
They have said they know the cause of Ms Adri-Soejoko's death but have not yet revealed this publicly.
In an earlier statement, DCI McHugh confirmed that police did "not have a motive for Lea's murder" and said she had died in "the most tragic way possible".
Ms Adri-Soejoko was last seen on Sunday evening and spoke to a friend on the phone at 2.30pm on Monday.
Neighbour Danila Catruta, 39, said she used to see Ms Adri-Soejoko in her garden, and that her murder had left her "scared" and "very surprised".
"I feel very sorry about what happened because no one should be treated like this," she said.
No arrests have been made so far.