Police arrested three men Wednesday over the robbery and murder of an 80-year-old woman in Tokyo last month, after investigators found similarities in the case with two other robberies targeting elderly people.

Tatsumi Komatsuzono, 27, Hiroki Sue, 22, and Yuta Sakai, 22, allegedly broke into the apartment of Kuniko Kato in Koto Ward on Feb. 28 and killed her. The three men have denied the allegations, according to the police.

A nursing caregiver found Kato dead the same day with her hands and feet bound. About two weeks before the murder, Kato told a friend she had received a suspicious phone call asking whether she kept money at home. She did not report the matter to police.