Egyptian security forces killed 12 Mexicans and Egyptians and injured 10 “by accident” on Monday, mistaking a tourist convoy for militants they were chasing in the country’s western desert.

Mexico’s foreign minister said she was traveling to Cairo late on Monday to seek answers from Egyptian authorities over an air strike that mistakenly killed Mexican tourists.

“We face of a terrible loss of human lives and an unjustified attack that obligates us to make the protection of our citizens the priority,” Foreign Minister Claudia Ruiz Massieu told reporters at Mexico City’s international airport.

Ruiz Massieu, who was due to fly later in the night, said she would travel with seven relatives of some of the victims as well as Mexican doctors to care for the wounded.

At least two Mexicans were confirmed dead, while another six were wounded and six more were unaccounted for, she said.

Egyptian authorities have said that a total of 12 people were killed and 10 wounded on Sunday when security forces fired on the group of tourists by mistake while hunting mlitant extremists in the Western Desert.

Ruiz Massieu said she would hold talks with top Egyptian officials in order to “obtain first-hand information that can clear up the circumstances of this deplorable event which has cost the lives of innocent Mexican tourists.”