Man detained after deadly shooting and stabbing attack in Nagano, Japan.

A man has been arrested after a stabbing and shooting attack in Nakano, Nagano prefecture, Japan, which left four people dead. The suspect, who is reportedly the son of the city assembly's speaker, stabbed a woman before shooting two policemen with a hunting rifle. The motive for the attack is unclear. Gun violence is rare in Japan, where handguns are banned and people have to undergo strict exams and mental health tests to buy a gun.