South Waziristan is considered to be the first major haven for Islamic militants outside Afghanistan since the 11 September 2001 attacks in the US and Pakistan's government has been under considerable pressure from the US to tackle militancy there.
US Senator John Kerry is currently meeting Pakistani leaders in Islamabad where he is expected to discuss America's multibillion-dollar aid package for Pakistan, amid concerns by some officials in the country that it comes with unacceptable strings attached.
Clashes between security forces and the Taliban have continued across the South Waziristan region, the BBC's Syed Shoaib Hasan reports from neighbouring Dera Ismail Khan.
Syed Shoaib Hasan, BBC News, Dera Ismail Khan
At the moment, the situation is a stalemate as the army tries to use ground troops backed by heavy weapons and air power to push back the Taliban.
The militants have entrenched themselves in fortified positions in the areas where the military is marching in. But they are likely to resort to traditional guerrilla tactics once the army is firmly inside territory controlled by the Mehsud tribe.
This is the heartland of the resistance, and it is here that the fate of the campaign will be decided.
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