Central Bureau of Investigation (CBI) has detained a Class 11 student of Ryan International School in Gurugram in connection with the September 8 murder of a Class 2 student. CBI sources said, the senior student was seen with a knife inside the school campus on the day the seven-year-old was killed with his throat slit in a school bathroom. <br/><br/>The detained student is suspected of having watched a pornographic clip in the morning, and on seeing Pradhuman Thakur in the school bathroom, he might have tried to sexually assault him when he entered it. <br/><br/>The detained student will now be produced before the Juvenile Justice Board later today, where the court is expected to decide whether he is to be treated as a major or a minor as per the Juvenile Justice (Care and Protection of Children) Act, 2015. Haryana Police had earlier claimed that Pradhuman was killed by school bus conductor Ashok Kumar inside the toilet.