MEXICO CITY - Eight human heads were found Tuesday in different places of Durango city, capital of Durango state in the north of Mexico, the General Prosecutor's office of Durango said.

The finding was due to anonymous phone calls telling about the exact places where the human heads were, the office said in a statement.

All of the victims were male between 25 and 30 years old. Their identities and the whereabouts of the corpses remain unknown.

But the police suspected the killing may be connected with an organized crime network, which was just dismantled days before.