Rohtak, July 12 -- Hansi police on Friday apprehended four students for allegedly stabbing to death a 50-year-old private school principal in Hisar's Bass village after he asked them to get haircuts, dress properly, and follow discipline. According to police, the accused boys-aged 15 and 16-are students of Kartar Memorial Senior Secondary School in Bass village, located in Hansi subdivision, about 26 km from Hisar. They attacked principal Jagbir Pannu, a resident of Puthi Saman village, with knives during his morning rounds on Thursday. Hansi SP Amit Yashvardhan said the boys were angry over repeated scoldings from the principal. They were caught on Friday from a bus stand in Mundhal village in Bhiwani district, around 15 km from the school. "All four were in school uniform at the time of arrest. They were upset because the principal often asked them to trim their hair, keep their shirts tucked in, and avoid drug use. He had earlier warned them not to carry banned items in their school bags. Believing he held a personal grudge, they planned the attack. Two carried out the stabbing, while the other two were involved in the conspiracy," he said. Police said the accused took responsibility for the attack and posted it to social media and even threatened to harm Pannu's son next if they were not paid Rs.10 lakh. Authorities said the boys would be sent to a safe house by evening. Teachers, speaking on condition of anonymity, said Pannu had warned the students multiple times about smoking and keeping untrimmed hair, but they ignored his instructions. "After stabbing the principal, the boys left their school bags in the classroom. A mobile phone and two energy drinks were found in one of the bags," a police officer added....