Police say two people were fatally stabbed and two police officers who came to investigate were shot dead

Japanese police have detained a suspect who had been holed up in a building after allegedly killing four people including two police officers in a gun and knife attack, an official said.

The man was taken into custody outside the farm property near the city of Nakano in Nagano region, with police confirming a fourth fatality overnight – an elderly woman who was found injured at the scene and later pronounced dead.