The operation conducted Thursday in Nawzad district in the southern opium-rich province of Helmand comes as speculation swirls over whether Taliban supremo Mullah Akhtar Mansour was killed in a firefight which broke out between insurgent commanders in Pakistan.
“Afghan special security forces… conducted a helicopter assault mission in Nawzad,” the US military said in a statement.
“After securing the prison, Afghan forces freed more than 40 prisoners comprised of Afghan Police, Afghan National Army and Afghan Border Police members.”
The statement did not say how and when the security personnel were taken hostage.
It was unclear what role US forces played.
The raid marks a rare success for Afghan forces struggling to beat back the stubborn insurgency rapidly expanding north from its southern hotbeds.
The insurgents captured northern Kunduz city for three days in September in a stinging blow to Afghan forces, who have largely been fighting on their own since the end of NATO’s combat mission last December.
The emboldened insurgents have stepped up attacks on government and foreign targets since they launched their annual summer offensive in late April.
But amid their rapid gains, confusion surrounds the fate of insurgent leader Mansour, who was shot in a firefight during an argument with commanders of the divided movement on Tuesday.
The Islamist group has vehemently rejected claims by militant sources and intelligence officials that Mansour was critically wounded in a shootout at an insurgent gathering near the Pakistani city of Quetta.
But speculation about his well-being intensified Friday after an Afghan government spokesman claimed on Twitter that Mansour did not survive the clash, which threatens to derail a fresh regional push to jump-start Taliban peace talks.