NEW DELHI, July 9 -- A 22-year-old woman and a six-month-old infant - the daughter of the woman's friend - were found murdered with their throats slit inside a house in Majnu Ka Tila on Tuesday afternoon, with Delhi Police identifying the woman's former live-in partner as the prime suspect. The woman, Sonal (who goes by a single name), had been staying for the past three weeks with her friend Rashmi Devi, the mother of the infant victim, after allegedly leaving her partner Nikhil following frequent quarrels, according to an investigating official privy to the case details. The child, Jasika, lived in the second-floor residence with her parents, Rashmi and Durgesh Kumar. Police said that Nikhil has been on the run since the murders, and investigators are working around the clock to track him down. Deputy commissioner of police (North) Raja Banthia said they received a distress call at 1.01pm from Rashmi, who reported that her daughter and her friend had been murdered. "When our team reached the house, we found both victims lying in a pool of blood with their throats slit," Banthia said. According to the preliminary probe, Sonal had previously lived nearby with Nikhil for the past five years. Their relationship, DCP Banthia said, had turned abusive. After one of several fights, Sonal moved in with Rashmi's family, who lived nearby. Banthia said that initial investigation has revealed that while Rashmi and her husband had stepped out to pick up their elder daughter from school on Tuesday afternoon, Nikhil allegedly entered the house and killed Sonal and the infant using a knife. Sonal hailed from Nainital in Uttarakhand. Police have registered a case and are investigating the exact sequence of events leading up to the killings....