A teenage Japanese boy has walked into a police station carrying a severed human head and claiming to have killed his mother.
The 17-year-old went to a police station in the town of Aizuwakamatsu, north of Tokyo, carrying the head in a sports bag, Japanese media said.
Japan's Kyodo news agency reported that the body of a woman was later found at the boy's home.
The incident is the latest in a string of grisly killings in Japan.
On Monday a severed human leg was discovered in a small river in central Tokyo.
In January, a 32-year-old woman was arrested after she confessed to killing her husband, dismembering him with a saw and dumping body parts around Tokyo.
In the latest case, the boy, said to be a high school student, reportedly told police he killed his mother overnight and acted alone.
Aizuwakamatsu is located in Fukushima prefecture, some 200km (125 miles) north of Tokyo.