Pakistani security forces have repulsed a ground attack by the NATO troops at Pakistan-Afghanistan border in South Waziristan, sources say.

Local officials and tribal elders told reporters that the fight between Pakistani forces and the NATO troops started late on Sunday at the Pakistan-Afghanistan border village Angoor Adda and continued for four hours but caused no casualties.

The tribesmen along with the security forces responded to the NATO attack and their fire power prevented the foreign forces from entering Pakistan territory to hunt for the wanted militants.

As the fighting erupted, the authorities sealed the Pak-Afghan border and the local residents fled the area for safety.

Also, earlier on Monday, some US drones violated the Pakistani airspace but after facing Pak fighter jets' fire, fled the area.

In September, more than 17 civilians were killed in a NATO airstrike in the same region, Angoor Adda.

Pakistan's Army Chief General Ashfaq Kayani vowed to defend the country "at all costs" and the local tribesmen also promised they would counter any US attack inside Pakistan territory.

The tribal areas especially Waziristan region have recently witnessed a string of missile attacks launched from suspected US drones.

RZS/RA