At least 36 engineers and technicians have been kidnapped in the past four years, according to a report from Mexican news site Animal Politico, with an English translation published by organized-crime monitoring group InSight. Worse, none of the engineers have been held for ransom — they’ve just disappeared. Among them include at least one IBM employee and several communications technicians from a firm owned by Mexico’s largest construction company. “The fact that skilled workers have been disappearing in these areas is no accident,” Felipe Gonzalez, head of Mexico’s Senate Security Committee, told the website.

“None of the systems engineers who disappeared have been found,” Gonzalez said. Unlike Colombia, where drug traffickers control large amounts of territory and can keep hostages for many years, Mexico’s drug territory is more in flux. “When they need specialists they catch them, use them, and discard them,” said the father of one kidnapped engineer.