Utsunomiya, Tochigi Pref., May 22 (Jiji Press)--One or more of the four 16-year-old boys arrested in last week's high-profile robbery-murder case in Tochigi Prefecture, eastern Japan, had been told to do a normal part-time job, Jiji Press learned Friday. They may have learned that the job assigned to them involved a robbery just before the incident, from suspect Kaito Takemae, 28, who is believed to have instructed them to carry out the robbery and murder at a house in the town of Kaminokawa. The Tochigi prefectural police are investigating who attacked the 69-year-old woman killed in the case. Takemae, his 25-year-old wife, Miyu, and the four high school boys have been arrested in the case. They are suspected of conspiring May 14 to kill Eiko Tomiyama at her house, which they broke into for robbery. More than 20 stab and other wounds were found on her body, mainly on the chest, and her first and second sons were also injured in the attack. According to investigators, the four boys headed for the scene in a luxury car and met Takemae and his wife at an expressway rest area, where Takemae reportedly provided them with weapons and assigned their roles. At the time, one or more of the boys apparently learned for the first time that the purpose was robbery. Of the four boys, the one arrested second, a resident of Sagamihara, Kanagawa Prefecture, also eastern Japan, broke into the house with two others and passed on to them the instructions he received from Takemae in real time. He had known Takemae and is believed to have played a central role among the boys at the scene. On the premises of Tomiyama's house, a decapitated pet dog was found. The prefectural police will investigate this on suspicion of a violation of the animal welfare law. END [Copyright The Jiji Press, Ltd.]