CNN  —  Prosecutors in northern Mexico’s Sinaloa state are investigating the discovery of 20 male bodies with gunshot wounds – including five that were decapitated – on a bridge over a federal highway. Local media reported that a message was also found hanging over the bridge in Culiacán. The prosecutor’s office told CNN it had no comment on the message but would investigate. Sinaloa Secretary General Feliciano Castro Meléndez called the case a “regrettable situation” and said it was “part of