KABUL, Afghanistan (AP) — An explosion ripped through a mosque inside an Afghan army base in the country's volatile eastern Khost province as Friday prayers were drawing to a close, killing 27 soldiers and wounding 57, the military said.

The blast may have been set off by a suicide bomber or a remotely detonated bomb but nothing was officially confirmed and details were sketchy. No group immediately claimed responsibility for the explosion.

President Ashraf Ghani condemned the attack in a statement as "anti-Islamic and inhumane." He also wanted to know how the army's security was breached, dem...