According to Afghan government spokesmen, a bomb exploded near a school in west Kabul on Saturday, killing at least 25 people, many of whom were young students.

Ambulances were rushing to the scene of the blast near Syed Al-Shahda school in the Shiite majority neighborhood of Dasht-e-Barchi, according to Interior Ministry spokesman Tariq Arian.

Angry crowds targeted ambulances and even assaulted health staff, according to Ghulam Dastigar Nazari, a spokesman for the Health Ministry. Residents were urged to comply and give ambulances unrestricted access to the site, he said.

At least 50 people were also injured, according to both Arian and Nazari, and the death toll could increase.

Although the Islamic State group previously claimed attacks against minority Shiites in the same city, no one immediately claimed responsibility for the attack.

The attack occurs just days after the last 2,500 to 3,500 American troops were ordered to leave the region. They'll be out no later than September 11th. The withdrawal takes place against the backdrop of a resurgent Taliban, who now rule or hold sway over half of Afghanistan.

As the withdrawal accelerates in the coming weeks, the top US military officer said Sunday that Afghan government forces face an unpredictable future and probably some "poor potential outcomes" against Taliban insurgents.