After Idaho suspect's arrest, police have a question: Why?

Police and FBI agents have arrested 28-year-old criminology graduate Bryan Christopher Kohberger in the fatal stabbings of four University of Idaho students in their beds on 13 November.

James Fry, police chief of Moscow, a city in northern Idaho, briefed media alongside prosecutor Bill Thompson, who appealed for the public to come forward with "anything you know" about the suspect.