A boy whose parents were stabbed to death at their home in Ibaraki Prefecture near Tokyo has told police that the assailant was a man acting alone, investigative sources said Thursday.The 13-year-old boy sustained serious injuries to his legs and arm in the attack early Monday, which took place when he was asleep in a bunk bed in a second floor room with his 11-year-old sister, who suffered minor injuries to her hands.Their parents Mitsunori, 48, and Miwa Kobayashi, 50, were murdered in their bedroom, also on the second floor. Autopsies determined they both died from loss of blood.According…READ FULL ARTICLE