Click to play videoNew Delhi: Pakistan has sealed off north and south Waziristan and the frontier region of Bannu from the rest of the North West Frontier Province.
Media reports from Islamabad said a major army offensive is building up in these areas.
Air strikes over the past two days were intended to soften up al-Qaeda and Taliban positions.
The reports said all hopes of reaching an accord with tribal fighters has been given up. The plan is to clear out tribal insurgents before Eid.
There is concern that nearly 250 Pakistani soldiers held captive in the mountainous region would be killed. Three have already been beheaded and some appear to have been killed during the air strikes.
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