Gunmen stormed Kabul University, killing at least 22 people including students in their classrooms, on Monday and Islamic State militants claimed responsibility for what President Ashraf Ghani called a “despicable act of terror”.

In a video message, Ghani, who once lectured at the university, announced a national day of mourning to honour the victims and offered his “condolences and profound sympathies to the nation” and the families of the victims.