DURANGO, Mexico - Eleven prisoners and six guards were killed Tuesday in armed clashes at a prison in northern Mexico that erupted when inmates attempted a jailbreak, state security officials said. The fighting broke out as wardens were “thwarting the inmates’ attempted prison break” in the city of Gomez Palacio, the public security office in Durango state said in a statement. Alarm bells rang out in the facility as the inmates mutinied, shooting at the guard towers and the wardens’ office, it added.