Derby police say an attack Monday morning on a woman is possibly related to two other assaults in the Glen Hills addition.
Police Chief Robert Lee said a woman reported being attacked by a man in a black ski mask who was carrying a knife in the area east of Rock Road near James Street and Meadowlark Court.
The woman reported the attack around 8:45 a.m., saying the man had entered the house through an unlocked front door. After a struggle, in which the woman sustained cuts from the knife, Lee said, the man fled.
One woman was raped in March and another was sexually assaulted in May in the same neighborhood. Both times, the attacker entered through either an unlocked door to the house or an unlocked garage door.
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Lee reminded residents to keep their doors to their houses and garages locked and their windows secure.
The man in Monday's attack is described as having a medium build with brown eyes, wearing a blue long- sleeve shirt, blue jeans and a black ski mask.
Anyone with information is asked to call Derby police at 316-788-1557.