Egyptian Bedouin in Sinai on Sunday kidnapped two Brazilian tourists, the third abduction of tourists in the peninsula this year, security officials said.
The tourists were returning from the historic monastery of St Catherine in southern Sinai when the tribesmen seized them, according to the officials, one of whom said both were teenage girls.
Other security officials could not confirm either their gender or age.
The officials said they had not yet established contact with the kidnappers to find out their demands, but they believed the perpetrators wanted the release of jailed tribesmen in return for the tourists.
One official said two armed Bedouin stopped a tour bus and abducted the tourists at gunpoint, before driving off with them towards the peninsula's mountains.