A man under arrest for allegedly dumping the dismembered corpse of an 88-year-old woman into a pond in Meguro Ward, Tokyo, has told investigators he strangled the victim because she woke up and discovered he had broken into her apartment.

"I strangled her with my hands to make her quiet," Yasunobu Ikeda, 28, allegedly told investigators.

He has already reportedly told them he had entered Tokiko Abe's apartment through an unlocked balcony door to steal money. The police are treating the case as a murder.