RAWALPINDI (APP) - A mentally disturbed woman allegedly killed her own mother and niece here on Saturday in Chak Bali Khan, Police said. Giving details, the Chowki Incharge Chuntra Police Muhammad Aslam said that a mentally disturbed woman Saima allegedly killed her mother Begum Jan and her niece Mehreen Fatima and a six-month old baby with a knife. After committing the gruesome murders, she tried to commit suicide. He said that Siama was married three years ago and she was divorced and living with her parents. She had also attempted suicide at her in laws, he confirmed. The police have registered a case and started investigation.