Egypt says negotiations are still ongoing to secure the release of 19 people abducted in southern Egypt.
A cabinet spokesman said that an earlier announcement by the foreign minister that they had been freed and were safe and well was premature.
The group includes five Italians, five Germans and a Romanian, along with eight Egyptians.
The government says they were taken across the border into Sudan, and the hostage takers have demanded a ransom.
The 19 were seized near the Gilf al-Kebir plateau, close to the Libyan and Sudanese borders.
Foreign Minister Ahmed Abul Gheit originally reported their release ahead of a meeting with US Secretary of State Condoleezza Rice in New York.
He said the hostages were "safe and sound".
But the cabinet spokesman, Magdy Radi, later said: "It is premature to say they are released. The negotiations are still continuing."
Tour owner's call
Egyptian officials say contact has been made with the kidnappers in Sudan, and that they are seeking a ransom of up to $6m (£3.24m).
The tourism ministry said those abducted along with the foreigners were two guides, four drivers, a guard and the owner of the travel company who had organised the excursion.
Gilf al-Kebir is a giant plateau famous for its prehistoric cave paintings, which featured in the 1996 film The English Patient.
The BBC's Ian Pannell in Cairo says local guides have indicated that the Gilf al-Kebir area has become increasingly unsafe this year.
Another group of foreigners was held at gunpoint in February and three of their vehicles were taken.
An investigation at the time pointed the blame at smugglers and bandits.
Our correspondent says there has been criticism that the Egyptian military has not done enough to patrol the area despite the increased threat.
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