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Three British tourists have died while climbing waterfalls in Vietnam.

The circumstances of their death, near Dalat in Lam Dong province in the central highlands, are not yet known, The Guardian reports.

Deputy director of the Lam Dong joint stock tourist company that manages the Datanla waterfalls, Vo Anh Tan, said visitors usually started at the top of the tiered waterfall, which was popular among western tourists.

Tan said an unauthorised local private tour operator arranged the trip for the tourists and apparently did not pay for entrance tickets and did not use the company’s safety gear, The Guardian reports.

He said the guide had been detained by police for questioning.

The state-run Tuoi Tre newspaper said the bodies of two women and a man who were British had been recovered.