KITAKYUSHU, Japan (Kyodo) -- Police continued their search on Monday for a man believed responsible for the stabbing death of a 15-year-old junior high school girl two days ago at a McDonald's restaurant in southwestern Japan.

The man, described by witnesses as being around 40 years old, also stabbed a male student who was waiting in line with the female victim, Saaya Nakashima, at the fast-food restaurant in Kitakyushu, Fukuoka Prefecture. The 15-year-old boy, who police did not name, survived but suffered serious injuries.

The assailant entered the restaurant and stabbed each victim once at around 8:30 p.m. Saturday as they were standing near the rear of a queue, according to the police. The attacker did not say anything during the incident and fled on foot, spending less than 30 seconds in the store.

Nakashima was stabbed in the abdomen and later confirmed dead at a hospital, while the boy, who was stabbed in the waist area and remains in hospital, was quoted as saying they were "stabbed by a complete stranger."

The two victims are believed to have been on their way home from cram school and entered the McDonald's together.