MIRANSHAH - Some of the world's most feared militants are quietly slipping away from the tribal region ahead of a long-rumoured military operation, raising questions about the effectiveness of such intervention.The exodus from the mountainous North Waziristan Agency on the Afghan border began in late May following air strikes, locals have told AFP.But it has been hastened by the Taliban's all-night siege of Karachi airport this week, which all but destroyed a tentative peace process.On Wednesday night two US drone strikes hit the region killing at least 16 in the first such attack this year, fuelling suspicion of coordination between the two countries, with Islamabad's patience for talks seemingly exhausted.But as pressure builds for a fuller response to the airport assault, which was joined by militants from Uzbekistan, residents and officials in the district's main town of Miranshah said the majority of foreign and local fighters had already left."Most of them have gone deep into the mountains towards the Afghan border," a senior security official told AFP.The locals said militant groups were also seen escaping from villages that are a known hub of the dreaded Haqqani network, an Al-Qaeda affiliate known for its spectacular attacks against US forces in Afghanistan.Residents saw foreign militants leaving the Machis Camp and Data Khel village near Miranshah, as well as the villages of Musaki, Hurmaz, Hesso Khel and Api.The fighters included Chechens, Uzbeks, Turkmen, Tajiks and Uighurs, residents and officials said. They arrived during the early 2000s, lured by the fiery rhetoric of Osama bin Laden and the chance to fight "infidel" forces in Afghanistan.Married into the local population, some have erected mud houses in small villages among the area's rugged mountains. Others "have rented houses and rooms here but they have now left towards the Afghan border", a grocery shop owner in Miranshah bazaar told AFP.Another resident in Miranshah estimated that more than 80 percent of local and foreign fighters have left North Waziristan. The migrations began on May 22 when Pakistani F-16s pounded suspected targets, killing at least 75 according to the military."Tribesmen are against war, they want to solve this conflict with talks and according to tribal traditions and that's why we have formed a peace jirga," jirga chief Sher Mohammed told AFP.Residents said some jirga members last week made announcements from mosque loudspeakers in several villages asking foreign fighters to leave the area.They also made those under their command hoist Pakistani flags to demonstrate their loyalty and ward off aerial attacks.Most areas along the border are not well demarcated, which allows militants to escape into Afghanistan."They have moved towards Shawal and Birmal," an intelligence official said, referring to remote villages on the Afghan border.A second security official said: "It is good that they (fighters) are leaving. We hope that tribesmen will not allow them to come and settle here again."In case of any military operation, we will face less resistance," he added.Residents said they have seen less activity of the feared Haqqani fighters in recent weeks. "They are also disappearing, probably they have gone to Khost, Paktia or Paktika," one resident in Miranshah told AFP, naming Afghan border provinces.Imtiaz Gul, a security analyst and long-time observer of the tribal areas, said the jirga and other threats of full-scale action in North Waziristan appeared to be a deliberate strategy on Pakistan's part."This was probably done with a clear intent and that intent was to let them cross the border if they like."As long they cross the border - why should it be Pakistan's headache? It's then the headache of Afghan and coalition forces," he said, adding that such movement had occurred in the past when Islamabad had launched operations in other parts of the tribal areas and in Swat Valley.According to Reuters, hundreds of Pakistani families have fled from a surge of fighting between government forces and militants into neighbouring Afghanistan, an Afghan government official said on Friday."Around 300 Pakistani families have escaped because they are worried about fighting between Pakistani forces and Pakistani Taliban," said Jabar Nahimi, governor of eastern Afghanistan's Khost province, over the border from northwest Pakistan."We have provided aid for 100 of these families and the rest will be helped soon ... We have also provided vaccinations as we are concerned about polio."This news was published in The Nation newspaper. Read complete newspaper of 14-Jun-2014 here.