(NEWSER) – Scores of inmates at a prison in the Mexican city of Monterrey are dead following a predawn riot on Thursday. The state governor in Nuevo Leon says 52 were killed and 12 more injured, reports the AP.

Gunshots and explosions were reportedly heard from within the prison, where a fire broke out, apparently after an escape attempt, per the BBC. Relatives on-site for conjugal visits reported seeing inmates with burns.

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