KANPUR, April 20 -- A 45-year-old medical representative allegedly killed his 11-year-old twin daughters by slitting their throats at their apartment in Kanpur's Kidwai Nagar area in the early hours of Sunday and then called the police emergency line himself to report the crime, police said. When officers from the local police station reached the apartment, they found the girls' bodies on the bedroom floor and a blood-soaked knife nearby. The father was sitting beside the bodies and was arrested on the spot. Kanpur's deputy commissioner of police (South) Deependra Nath Chaudhary confirmed the arrest and said no clear motive had yet emerged. "We received a call on 112 at around 4.30 am from the accused himself," Chaudhary said. The officer added that police were linking the incident to possible depression or a psychiatric condition. It is being investigated whether he was receiving any psychiatric treatment. The medical representative's wife was asleep in another part of the flat and learned of the killings only when officers knocked. She told reporters her husband should be hanged the same day. Investigators said the medical representative had grown increasingly unstable after his mother's death a few months ago. She told the police he had repeatedly spoken of wanting to die and of taking the twins with him. He had also installed CCTV cameras throughout the flat, from the entrance gate to the kitchen and bedrooms, and kept his wife under constant surveillance. She was effectively barred from his room. The girls largely stayed with him, and he had told his wife on several occasions to leave with their son and let him raise the daughters alone. The wife told the police the previous evening had appeared normal. The family had dinner together before the father took the children to his room and spoke on the phone for a long time. Watching the CCTV feed from outside, she saw him take one daughter to the bathroom around 2.30 am, return, and switch off the light. She went to sleep and was unaware of the killings until morning. A large quantity of medicines was recovered from the father's room. Forensic officials noted the bodies were found on the floor with the bed entirely clean, and said the accused may have smothered the children before using the knife. Police are also examining whether he sedated them beforehand, given his professional access to drugs. The wife confirmed he regularly took sleeping pills. The girls were students of Class 5 at a school, opposite their building. Their six-year-old brother was with his mother at the time. The medical representative was reported to be in a stable financial condition, and police said there was no apparent dispute over money....