Egyptian authorities have not said what weapons were involved in yesterday's attack in the Western Desert, in which 12 people died and 10 more were wounded.
But six Mexican survivors told Mexico's ambassador to Egypt that they had stopped for a meal when they "suffered an aerial attack with bombs launched by a plane and helicopters," Foreign Minister Claudia Ruiz Massieu told a news conference.
Ruiz Massieu said that for now at least two Mexicans have been confirmed dead.
She said her ministry delivered a diplomatic note to the Egyptian ambassador in which the Mexican government expresses its "deep dismay over these deplorable events" and demands a "swift, exhaustive and deep investigation."
"The Mexican government asks that Egyptian authorities give the highest priority and urgency to clearing up this issue," Ruiz Massieu said.
Egypt's interior ministry said yesterday that a joint police and military operation was "chasing terrorist elements" when it "mistakenly" targeted four pick-up trucks carrying Mexican tourists.
It said the tourists were in an area that was "off-limits" but did not provide an exact location.
