UNB, Chittagong :Seven activists of Chittagong College unit of Bangladesh Chhatra League (BCL) were injured, including three with bullets, in a factional clash over establishing supremacy on the campus on Sunday.Witnesses said, Jubo League leader Nurul Mostafa Tinu and city unit BCL Vice-president Nurul Azim Rony had long been at loggerheads. As a sequel of the enmity, their groups attacked each other on the campus.They also exchanged bullets during the melee, leaving seven people injured from the both sides. The supporters of Tinu blocked the road in front of the college, disrupting traffic for several hours.On information, police rushed in and dispersed them charging baton on them.The situation returned to normalcy at around 3 pm, said Abdul Aziz, Officer-in-Charge of Chwakbazar Police Station. Bullet-hit Bappi, Jibon and Imam were taken to Chittagong Medical College Hospital, said Pankaj Barua, assistant sub-inspector of CMCH police camp.