ISLAMABAD - Special Committee of Parliament on National Security has summoned foreign, defence and interior ministers and the Director General Inter -Services Intelligence (ISI) for briefing on US drone attacks on the territory of Pakistan, reliable source told TheNation on Thursday. The Committee was presided over by Leader of House in the Senate Mian Raza Rabbani. The Committee strongly condemned US drone attacks in Bannu District in which six people were killed and termed it severe violation of the country's sovereignty. The source said that the committee summoned the ministers of defence, foreign and Interior and the Director General ISI for seeking detail and actual situation. After meeting, Chairman Special Committee of parliament Raza Rabbani told the media personnel that Pakistan would leave no stone unturned to take stern action if the US did not stop attacks. He said that the US disgraced the resolution of joint sitting of the Parliament by violating the sovereignty of Pakistan.