Egyptian police officer uses a walkie-talkie as Mexican embassy members stand outside Dar Al Fouad Hospital in Cairo.

Mexico’s government demanded on Thursday that Egypt compensate tourists mistakenly attacked by Egyptian security forces at the weekend in a deadly incident that outraged the Latin American nation.

The demand was made in a diplomatic note delivered by deputy foreign minister Carlos de Icaza to Egypt’s ambassador to Mexico, as survivors and families of victims were flying home with Foreign Minister Claudia Ruiz Massieu.

“The Mexican government demands the necessary guarantees so that the victims of the tragic and regrettable attack perpetrated on September 13, all of them innocent civilians and their families, receive full reparations for the damage, including compensation,” the foreign ministry said in a statement, without providing a figure.

Eight Mexican tourists and four Egyptians were killed in Sunday’s attack in the Western Desert. Ten people were wounded, including six Mexicans.

Survivors have told Mexican diplomats that they came under fire from a plane and helicopters.

Egypt said the tourists had entered a restricted area and were “mistakenly” killed as security forces chased jihadists who had abducted and beheaded an Egyptian.

But the head of Egypt’s tour guides union said the group had received all the required permits and were accompanied by police escort.

President Enrique Pena Nieto dispatched Ruiz Massieu to Cairo this week to press for a full investigation.

The minister and survivors are due home Friday.