Pakistan will not allow militants to carry out attacks on its check posts and border villages and kill civilians, he added.
Abbas said the additional forces were sent after Nato and Afghan forces failed to act on Pakistan's call for action against militants responsible for cross-border attacks. About 100 Pakistani security personnel have died in cross-border attacks by Afghanistan-based militants during the past four months, Abbas told Radio Pakistan.
The International Security Assistance Force was informed about these attacks and the location of militant hideouts in Afghanistan was pointed out but no action had been taken so far, he said.
Apparently there is no presence of the Afghan army in the "vast area" from where militants were operating against Pakistan, he said.
The Dir region was hit hardest by the cross-border attacks and terrorists who fled the Swat valley to escape a Pakistani military offensive were involved in these attacks, Abbas said. The militants were launching these attacks from Afghan territory so that they could return to Swat via Dir, Abbas contended, adding all check posts along the Afghan border have been strengthened and the number of posts in Dir increased.
Abbas claimed the militants had safe havens in the Kunar, Nuristan and Ningarhar provinces of Afghanistan, where "there are no security forces".
"It seems the militants are being supported locally and operating freely," he said, but added that Pakistan cannot launch any operation across the Afghan border.