ISLAMABAD- Prime Minister Nawaz Sharif has summoned a national security conference tomorrow, which contrary to normal practice will also see attendance from parliamentary leaders of various political parties. According to our sources, conference has been summoned on an emergency basis to discuss the political scenario prevailing in the country, particularly the impending marches of PTI and PAT and their impact on Operation Zarb e Azb. The conference is also scheduled to discuss matters relating to the country's internal security and the participants are expected to be briefed on the anti-terror war, as well as the military operation under way in North Waziristan. Sources said that leaders of all the political parties having representation in the Parliament have been extended the invitation through telephone calls. The conference will be attended by all four chief ministers, Chief of Army Staff Raheel Sharif and Director General Inter-Services Intelligence Lt Gen Zaheerul Islam.