DUCSU vice-president Nurul Haque and around 20 others came under an attack allegedly by the activists of Bangladesh Chhatra League and Muktijuddha Mancha on Sunday.
BCL is the student wing of ruling Awami League while Muktijuddha Mancha is a platform of freedom fighters' descendants.
Besides, Dhaka University Central Students' Union (DUCSU) VP Nurul, Rukmia Hossain Raz, Golam Kibria and Zahidul Islam of Kabi Nazrul College, Ariful Islam of Jahangirnagar University, Moshiur Rahman of Dhaka University and Aminur who claimed himself Nurul's younger brother were injured in the attack.
Witnesses said the attack was carried out on Nurul and some activists of Bangladesh General Students' Rights Protection Council (BGSRPC) when he was holding a meeting at his DUCSU office around 1:00pm.
The activists of BCL and a faction of Muktijuddha Mancha allegedly hurled brick chips at Nurul's DUCSU office room when he and some of his associates were there around 12:30pm.
At one stage, BCL DU unit president Sanjit Chandra Das and general secretary Saddam Hossain along with their followers reached in front of the DUCSU office and asked them to come out but Nurul denied, leading to an altercation.
When the two BCL leaders left the scene, their followers attacked on Nurul and others.
DU's proctor AKM Golam Rabbani rescued Nurul and other injured and sent them to Dhaka Medical College Hospital around 45 minutes after the attack, said the witnesses.
Dhaka Medical College Hospital director AKM Nasir Uddin told Prothom Alo that around 15 to 20 injured had been admitted at the DMCH.
They were being given treatment with highest priority, he added.
Earlier on 17 December, DUCSU VP Nurul came under an attack on the Dhaka University (DU) campus reportedly by the Muktijoddha Mancha activists.