Mexico's government said 32 small coal mines in the northern state of Coahuila have been closed due to safety concerns, a move taken after 13 miners were killed in that region in less than a month. In a press conference on Thursday, Labor and Social Welfare Secretary Rosalinda Velez announced the suspension of work - effective immediately - at 32 mines in Coahuila, citing violations of safety regulations. The measure, which comes after 13 mine workers were killed in Coahuila in two recent accidents, permanently shutters 14 mines and temporarily closes 18. Velez said her secretariat and the economy portfolio will work jointly on revoking licenses at mines where "serious violations of regulations" have been detected.