Investigators are searching for three men who left bloodstains in a taxi they hailed Saturday night near a house in Tokyo's Setagaya Ward where a family of four was found murdered Sunday morning, police sources said.
Some of the blood found at the crime scene did not match that of the murdered family, leading police to believe that one of the assailants may have been injured in the attack, the sources said.
On Tuesday, Metropolitan Police Department chief Takeshi Noda inspected the site of the murders and ordered all investigators on the case to step up efforts to find the perpetrators, calling the crime "ultimately heinous."