Pakistani security forces and al Qaeda linked militants hiding in the tribal regions near the Afghan border exchanged fire on Sunday but no casualties were reported, the army said.
Militants from their mountainous hideouts fired rockets and mortars at Pakistani troops in the South Waziristan region's Shakai valley, military spokesman Major General Shaukat Sultan told AFP.
The "intermittent fire" by militants continued during the day, he said. "The miscreants seem to have some positions in the mountains and it is an important for the security forces to respond to such attacks."
Pakistani forces and militants have been trading fire in the area since a major military operation in the Shakai valley in mid-June left 65 foreign fighters and their local supporters dead.
Some 18 troops were killed in last month's operation, during which the army said it dismantled an al Qaeda training camp and some of the hideouts.
Pakistani authorities have been pressing conservative tribes to expel hundreds of Chechen and Uzbek fighters who sneaked into the region after the US-led offensive ousted the hard-line Taleban regime in the wake of the September 11, 2001, terror attacks in the United States.