Many of the injured remained in critical condition. Earlier reports said that 25 people were killed and 36 others injured Xinhua reported.
Most of the victims were high school graduates who attended lessons on preparation for university entry test. Among the victims were many female students.
The UN mission in the country condemned the attack saying in a statement that "no justification whatsoever for targeting civilians at any time under any circumstances."
No group has claimed responsibility yet. However people pointed finger at the hardliner Islamic State (IS) group saying the extremist outfit could be behind the deadly attack as it did in the past.
--IANS ahm/