The four men accused in the killing of Jahangirnagar University student Zubair Ahmed fled from the court after a Dhaka judge quashed their bail on Sunday.
Khandakar Ashikul Islam, Khan Mohammad Rois, Mahbub Akram and Ishtiaq Arup appeared before the court and pleaded for bail on Sunday afternoon.
Bail pleas were also filed for accused Rashedul Islam and Zahidul Islam, but they did not appear before the court. The six are all activists of Bangaldesh Chhatra League.
Dhaka Speedy Trial Tribunal 4 Judge ABM Nizamul Haque cancelled the bail plea of the six after hearing.
Soon after the bail plea was rejected, the four accused fled from court premises, the court's public prosecutor SM Rafiqul Islam confirmed to the Dhaka Tribune.
Honours final year English student Zubair, a former activist of Chhatra League, died on January 9, 2012 - a day after being severely tortured on the campus by the accused.