Police are at Heath Road and West Meadows working out if the incident are linked.
Hemsby: British Police Return From Thailand
British police who traveled to Thailand to review the probe into the murder of Hannah Witheridge from Hemsby are due to return to the UK, having completed their work ``as far as possible''.
Officers from the Metropolitan Police flew out last month to work with the Royal Thai Police after an agreement between David Cameron and military ruler General Prayuth Chan-ocha.
It followed international concern about the way the case has been handled by the Thai authorities.
The body of 23 year-old Hannah was found along with that of fellow Brit David Miller, who was 24, on a beach on the island of Koh Tao in September
Two Burmese men, named as 21-year-old bar workers Zaw Lin and Win Zaw Htun, were charged with the killings and paraded in front of cameras after apparently making confessions, but these were later reportedly withdrawn.
UK police concerns are understood to have been around the verification of DNA samples of the suspects and allegations of their mistreatment.
Scotland Yard said officers will compile a report from their review.
In a statement, the Met said: "Detectives from the United Kingdom who are currently in Thailand reviewing the investigation into the murders of Hannah Witheridge and David Miller have completed their work, as far as possible.
"They will now be returning to the UK to compile their report and to update the families of Hannah and David on their findings.
"The police team wish to thank the Thai authorities for facilitating the visit.''
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