SAMASTIPUR, June 3 -- A 16-year-old schoolgirl was killed and two of her friends sustained critical injuries after a sand-laden truck allegedly ran over them while they were on their way to a coaching institute in Bihar's Samastipur district on Tuesday morning, police said. While Nikita Kumari, a Class 10 student, died, Neha Kumari and Shanti Kumari were injured and referred to Darbhanga Medical College and Hospital for advanced treatment. Following the collision, the truck overturned on the roadside and its driver fled the spot. Rosera SHO Lal Babu Kumar said efforts were underway to trace the driver....