A 26-year-old man under arrest for possessing a knife following a fatal assault in Kobe was served a fresh arrest warrant Monday for the alleged murder of his grandfather, one of the three people police believe he killed in a rampage with a knife and baseball bat.

Kanami Takeshima was arrested Sunday for possessing a kitchen knife at a shrine close to where his grandparents and a nearby resident were found collapsed and later confirmed dead.

The suspect's grandfather, Tatsuo Nambu, and his wife Miyuki, both 83, and a 79-year-old neighbor were found at their homes with stab wounds. The suspect lived with the elderly couple. His mother and another neighbor were wounded.

The man has told the police he "just wanted to attack and stab anyone."