(MEXICO CITY) — Investigators are now certain that 43 college students missing since September were killed and incinerated after they were seized by police in southern Guerrero state, the Mexican attorney general said Tuesday. It was the first time Jesus Murillo Karam said definitely that all were dead, even though Mexican authorities have DNA identification for only one student and a declaration from a laboratory in Innsbruck, Austria, that it appears impossible to identify the others. The attorney general cited confessions and forensic evidence from an area near a garbage dump where the Sept.