THIRUVANANTHAPURAM: A clash broke out between the activists of KSU and SFI amidst the preparations of school Praveshanolsavam. The incident happened at Vellarada in Thiruvananthapuram. SFI Vellarada area president Manzoor and other activists were beaten. Following the incident, the office of congress’ Vellarada mandalam committee office were attacked today. Nine congress activists were injured in the attack and they have been admitted in the hospital.