12 people were killed and 10 more were injured on Sunday when Egyptian anti-terror forces attacked a Mexican tourist convoy they believed to be militants, Reuters reports.

“A joint force from the police and military, whilst chasing terrorist elements in the oasis area of the Western Desert tonight, accidentally engaged four four-wheel drives belonging to a Mexican tourist group,” the country’s Ministry of Interior said in a statement. “The incident resulted in the death of 12 Mexicans and Egyptians.”

According to the BBC, the ministry claims the tour buses were traveling in a “banned area” at the time of attack, the circumstances of which are currently being investigated.

Earlier in the day, ISIS-affiliated fighters claimed they had repelled an attack by Egyptian security forces in the Western Desert, the Guardian reports.

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