At least 15 military cadets were killed in a suicide bombing in Afghanistan’s capital Kabul on Saturday, AFP reported. The explosion took place in PD5 district of Kabul at the entrance gate of the Marshal Fahim Military Academy, according to Tolo News. At least four cadets were injured, authorities said.

The cadets were trainees from the Daud Khan Military Hospital. No one has claimed the attack yet.

Afghan Defence Ministry spokesperson Dawlat Waziri said the attack was carried out on foot when the on-duty officers were on their way home, AP reported.

The North Atlantic Treaty Organisation’s Resolute Support mission said the latest incident was an “attack on the future of Afghanistan”. “This attack in Kabul shows the insurgents are desperate and cannot win” against Afghanistan’s security forces, it said on Twitter.

The attack brings the toll in the last week of various attacks by militant groups to around 200, reported BBC. The incident comes a day after at least 72 people, including children, were killed in an attack at two mosques in Afghanistan.