ISLAMABAD - Lack of credible intelligence about reinforcements and supplies from neighbouring Afghanistan into Waziristan, has puzzled security experts in evaluating actual strength of the besieged militants in South Waziristan. Background discussions and interviews by TheNation has revealed that security experts were divided over the actual strength of insurgents fighting force and sources of their supplies. Some of them were of the view that TTPs late commander Baitullah Mehsud and his terror networks in South Waziristan had sufficient stocks of weapons and explosives to stand the offensive launched by Pakistani security forces. However, others believed that reinforcements and supplies from Afghanistan into Waziristan continue unabated. Reinforcements and supplies to the militants in Waziristan had actually increased from Afghanistan since Pakistani security forces besieged Waziristan two months ago, sources said. They pointed out that a large number of ethnic Uzbek and Tajiks fighters from Afghanistan have recently joined militants in South Waziristan. Few of them even blamed Indian spy agency RAW that, according to them, was actively involved in organising reinforcements and other supplies from Afghanistan into Waziristan. Meanwhile, troops from 11th Corps along with paramilitary forces supported by helicopters and PAF aircraft launched the three-pronged offensive on Saturday in order to crush networks blamed for some of the worst attacks that have killed more than 2,250 people over the past two years. Security sources said that the operation would continue until the objectives are achieved. The army has blocked all entry and exit points of Waziristan.