Police laid a siege to Hyderabad city for 10 hours on Saturday to foil pro-Telangana students to march towards the state Assembly, throwing normal life out of gear by forcing a curfew-like situation. Violence broke out late in the evening after a youth attempted self-immolation in Osmania University campus raising slogans for a separate Telangana state even as scores of police personnel present their were caught by surprise. He was admitted to the DRDL Apollo hospital in a critical condition after having sustained 85 per cent burns. The incident sparked a fresh battle in the university campus between students and police who fired rubber bullets and tear gas shells.Earlier in the day, about 100 students tried to break the heavy police cordon and run towards the Assembly but the police immediately took them into custody. Movements of vehicles were severely restricted as police put up barricades into the roads. Nine-foot tall barricades with barbed wiring were put up at many places, making it difficult even for pedestrians to walk.