(CNN) -- A roadside blast killed nine Afghan National Army soldiers and wounded four in eastern Afghanistan, a provincial official said Sunday.
The attack occurred Saturday afternoon while the soldiers were patrolling in Gardez, the capital of the Paktia province, said Ruhullah Samoun, spokesman for the provincial governor.
It was not immediately clear whether there was a claim of responsibility for the attack, though the Taliban have previously targeted Afghan and NATO troops in the area.
In August, a suicide truck bomb ripped through the main security gate of a U.S. military base in Gardez, killing at least two local guards and injuring nine others, the International Security Assistance Force said at the time.
The Taliban claimed responsibility for attack.
CNN's Ruhullah Khapalwak contributed to this report.