ASADABAD, Afghanistan — Taliban insurgents overran an Afghan National Army base near here Sunday morning, killing 21 soldiers in their bunks in what appeared to be the worst single blow to government forces since 2010, according to government and insurgent officials.
President Hamid Karzai ordered an investigation and canceled a planned state visit to Sri Lanka in response to the attack, in the Ghaziabad district of Kunar province, near the eastern border with Pakistan.
The attack highlighted the vulnerability of Afghan military units, which are generally no longer accompanied by American or other NATO advisers and do not have the close air support they often enjoyed. And it raised questions about the Afghans’ ability to hold out against the insurgents on their own. Full story for BostonGlobe.com subscribers.