The arsonists also vandalised 17 refrigerators of a company who sponsored the concert, witnesses said.
Some 100-150 men also vandalised the stage and instruments kept beside it for the concert around 1:00 am, they said.
Some BCL leaders blamed activists of its other faction for the attack.
BCL DU unit president Sonjt Chandra Das said, "Such acts can never be acceptable. If any activist of BCL is found involved in this incident must get organisational punishment."
He also demanded administrative punishment of those involved in the incident and said, "I hope the university administration will take strict measures against the culprits so that never dare to repeat such acts."
DU Proctor AKM Golam Rabbani said," We’re investigating the matter and trying to find out the culprits behind the incident."