Pakistani military officials say at least four soldiers were killed when a military convoy struck a roadside bomb in a northwestern tribal area near the Afghan border.
The bomb also wounded five soldiers in the village of Spinwam, in the North Waziristan tribal region.
No one has claimed responsibility but authorities have previously blamed Pakistani Taliban for similar attacks.
North Waziristan is one of the main strongholds of the Pakistani Taliban.
The umbrella Tehrik-e Taliban Pakistan faction and Al-Qaeda-linked militants in recent years have carried out hundreds of attacks on security forces and government forces, concentrated largely in the northwest.
Based on reporting by AP and AFP