Pakistan's military says at least 48 militants and 20 soldiers have been killed in fighting Sunday in the North Waziristan tribal region.
An army spokesman Major General Waheed Arshad says security forces attacked the pro-Taleban militants after they ambushed a military convoy Saturday evening near the town of Mir Ali.
Later, militants attacked a military convoy in the Hasu Khel area of the same region. The Pakistan military says fighting in the area is still continuing.
Violence has been escalating in Pakistan's northern tribal regions bordering Afghanistan since July, when a peace pact with militants broke down in North Waziristan, and army commandos stormed a radical mosque in the capital, Islamabad.
Militants in South Waziristan are still holding more than 200 Pakistani soldiers captured at the end of August.