A police constable shot dead the wife of a special police officer (SPO) and her younger sister before shooting himself dead with his service rifle at Kalakote in Rajouri district on Sunday night.Rajouri SSP Mubassar Latifi said it was too early to say anything about the reason behind the crime and a special investigation team had been constituted to inquire into it.According to reports, constable Sanjay Singh forciby entered the house of SPO Chaman Lal at Thermal Colony at Kalakote. He shot dead the SPO’s wife Urmila, 26, and her younger sister, Nishu, a class-11 student, who stayed with her. He then shot himself dead.There have been two conflicting but unverified versions about the incident doing the rounds. According to one, the constable reportedly wanted to marry Nishu, to which she had first agreed, but later refused. Another version is that the accused had illicit relations with Urmila.