Tribesmen in the mountains of central Yemen kidnapped two Austrians a week ago as they visited a site known as the Queen of Sheba's throne.
In that case kidnappers also demanded the release of arrested members of their tribe. The Austrians were freed unharmed after the government told the tribesmen it would look into their complaints.
Two Swiss tourists were kidnapped in the same area as the Austrians a month earlier but released two days later.
They were grabbed by members of the al-Jizah tribe in an effort to win the release of one of the kidnappers' brother, who had been arrested on charges of stealing a car.
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