Security forces in southern Afghanistan found 27 shackled Afghan men in a makeshift Taliban prison compound, NATO's International Security Assistance Force said on Wednesday.
The force said the men appeared to be tortured and were taken to a base for a medical screening and debriefing. Officials were trying to determine the men's identities, the force said.
Tips and intelligence led to the discovery of the compound on Tuesday near Musa Qaleh in Helmand province.
When troops approached the compound, insurgents fired on them, the force said.
In the ensuing gun battle, 13 insurgents were killed when they did not comply with orders to lay down their weapons, the force said.