AYOTZINAPA Mexico (Reuters) - Mexican police killed three trainee teachers, shot another in the head and another in the face, and herded dozens more into police trucks to what investigators fear was a massacre on a remote hillside, survivors of the incident say.

On the night of Sept. 26, officers that a state prosecutor says have links to a violent criminal gang in the southwestern city of Iguala pursued about 80 members of a nearby teaching college well-known for its left-wing radicalism, witnesses said.