A 19-year-old police officer was arrested early Thursday on suspicion of shooting a senior colleague to death at a police box in Shiga Prefecture, investigators said.
Sergeant Akira Imoto, 41, was found collapsed at around 8:45 p.m. Wednesday at the police box in front of Kawase Station in the city of Hikone, police said. He was later pronounced dead at a hospital.
Investigative sources said verbal abuse by the senior officer may have been a motive for the killing.