Police have said they are unsure if a British woman reported missing from a yacht in the Caribbean was onboard.
Sarm Heslop, 41, from Southampton, had been staying with her boyfriend, US citizen Ryan Bane, on the boat moored off St John in the US Virgin Islands.
Mr Bane reported her missing from the boat at 02:30 local time on 8 March.
Virgin Islands Police Department said: "Investigators cannot confirm with certainty, if and when Ms Heslop boarded the Siren Song on March 7."
Miss Heslop, a former flight attendant, is known to have gone for dinner with Mr Bane on Sunday, 7 March in St John.
It was understood she had returned to the yacht and gone to bed.
Her possessions, including her bank cards and mobile phone, were still onboard when she vanished.
Responding to reports in the media that Mr Bane had sailed away from the area, Virgin Islands Police Department (VIPD) spokesman Toby Derima said: "To the knowledge of investigators, Mr Bane remains in the Territory."
He added: "His whereabouts are known by law enforcement."
VIPD said the investigation into Ms Heslop's disappearance was being assisted by the FBI and police in the UK, who were "finding and interviewing witnesses".
The force added searches for Ms Heslop on St John and nearby St Thomas were ongoing.
Friends of Ms Heslop in the UK said they were "hugely grateful" that UK police were involved.
They also thanked those still scouring the island for her.
"Locals in the USVI are back out putting up fresh posters and continuing their efforts," they said, adding: "We cannot thank them enough."