Officials in Poland say a Polish tourist who died in an Egyptian resort last month may have been a victim of human trafficking as well as organised crime.
The Polish tourist, named in media reports as Magdalena Zuk, travelled alone to the Red Sea resort of Marsa Alam at the end of April.
Days later, she plunged to her death via a hospital window.
Egyptian security sources as well as medical staff say the 27-year-old woman took her own life.
There has been speculation the woman was the victim of a sexual assault by hotel staff, nevertheless Egyptian security sources have denied which she was drugged as well as raped.
However, Polish investigators say they are following several lines of inquiry, including forced prostitution, human trafficking as well as people smuggling.
Local media report which the young woman arrived inside the resort, some 750km (450 miles) south of Cairo, on 25 April, as well as was planning to spend a week there.
nevertheless for reasons unknown her plans changed, as well as she tried to fly home via the local airport, nevertheless was not allowed on the plane because she was acting strangely.
She was taken to hospital, via where CCTV footage has emerged apparently showing her acting erratically as well as being restrained by two men.
Hospital manager Mohamed Sami Gomaa told the privately-run CBC channel she tried to throw herself via a window repeatedly.
Staff say she was later tied to a bed, nevertheless managed to escape, attack a nurse as well as jump via the building.
Mr Gomaa also said no rape check had been carried out because she had not made a complaint.
The Polish foreign ministry has said which is actually the responsibility of the Egyptian authorities to clarify the circumstances of the death.