Man Kills 3, Including 2 Police Officers, in Rare Japanese Shooting

A 31-year-old man attacked four people with a rifle and knife in Nagano, Japan, killing three including two police officers.
The suspect barricaded himself in a building for 12 hours before being arrested.
Gun violence is extremely rare in Japan due to strict gun control laws.
The suspect's motive and identity are unknown.
Details about the suspect and motive are currently unknown, but violent crimes are rare in Japan due to strict gun control laws.