In the late afternoon hours of 25 May 2023, an assailant armed with a knife and a firearm stabbed a woman and shot at police officers who responded to the occurrence in Nakano City, located in the central Nagano prefecture. The woman and two police officers were killed, while at least one more person was injured. According to local media reports, the suspect has barricaded himself in a home near the scene of the event. City officials have advised nearby residents to stay indoors. Additional details regarding the suspect and a motive for the attack have yet to emerge.