KOLKATA: The sexual assault and murder of the seven-year-old girl in Tiljala was a planned crime, with the accused, Alok Kumar Sah, having stalked the child for at least two weeks, police said. Alok had clicked her photographs and studied her movements, especially her whereabouts on weekends, the probe revealed. Cops said Alok had chosen the day of the murder carefully. "Alok Kumar Sah had been...