Afghanistan's Defence Ministry stated that security forces killed 41 insurgents and captured 62 others over three days of border clashes in the Kamdesh district of Nuristan province.
The ministry claimed the fighters, including Islamic State members, crossed into Afghanistan with Pakistani support, prompting the Foreign Ministry to hand a protest letter to Pakistan's charge d'affaires.
Pakistan's Ministry of Information has rejected similar past claims, and the latest casualty figures from the cross-border violence could not be independently confirmed.