Four teachers injured after stun grenade explodes during anti-terrorism drill at Russian school

Officials did not specify whether those injured were students or teachers.

Several people have reportedly been injured in an explosion in a western district of the Afghan capital Kabul.

The circumstances under which the student acquired the grenade and why it was detonated remain unknown, Afghanistan's leading news agency, Khaama Press, reported.

Decades of conflict have left Afghanistan littered with the explosive remnants of war, with the country registering the third-highest casualty rate globally according to the United Nations.