Pakistan military spokesman has affirmed al-Qaedas presence in South Waziristan saying the troops have sealed the two sides of the Mehsud region. In an interview to British news agency Athar Abbas said the security forces can face stiff resistance from the militants due to presence of foreigners in their ranks. The airstrikes continued in the region as the forces have clogged all exits of Taliban with cordon of the Mehsud region. Taliban could not flee to North Waziristan or NWFP, Abbas said. Success of the operation is must. South Waziristan will be cleaned of the terrorists and militants like Swat, Director General ISPR said.