MEXICO CITY — The six Mexican survivors of an air attack by Egyptian security forces on a group of Mexican tourists and their Egyptian guides returned to their country on Friday as the Mexican government said it would seek compensation on their behalf from Egypt.

The presidential jet carrying the survivors, their families, Mexico’s foreign minister and a team of Mexican doctors landed here at 8 a.m. Friday. The survivors, five women and one man, were taken off the plane — some on stretchers, others in wheelchairs — and flown by helicopter to a hospital here.

Twelve people were killed in the attack on Sunday: eight tourists and four Egyptians. The circumstances of the case remain as murky as they were at the beginning of the week.

The Mexican government repeated its demand for an “exhaustive, transparent and thorough” investigation in a diplomatic note presented to the Egyptian ambassador here late Thursday. The note also said that the Mexican government would seek full reparations, including compensation for damages, for the victims and their families, but did not say how much.