[1][2] According to a witness, a masked man wearing camouflage chased a woman while brandishing a large knife, before stabbing her in the back.

[3] Upon the arrival of officers at the scene, the suspect fired what appeared to be a hunting rifle, striking multiple people.

The officers were identified as Inspector Yoshiki Tamai and Sergeant Takuo Ikeuchi, who were not equipped with bulletproof vests while responding to an emergency call.

[2][7] The Nagano Prefectural Police (NPP) requested an arrest warrant for the man on suspicion of murder on the morning of the 26th.

[13] Following the arrest, residents of the area were initially compelled to find alternative accommodations for the night, and the local school remained closed.