The top court accepted multiple petitions for hearing against "Memogate" scandal, filed by PML-N chief Nawaz Sharif and others and constituted a committee, under Tariq Khosa to investigate the "Memogate" and asked Asif Ali Zardari and Chief of Army Staff Gen. Ashfaque Pervez Kayani to submit a written reply within 15 days.

The petition names 13 respondents including Zardari, Gen. Kayani and the Director General of the Inter-Services Intelligence (ISI).

The court in its orders said the issue would be heard by the court as it was related to the national security and no one should have objection on the hearing.

The memo, which was allegedly conveyed to Gen. Mike Mullen by Haqqani a week after the Osama Bin Laden killing in a US raid in May, was reportedly sent by Haqqani to Mansoor Ijaz at the behest of Zardari who at the time feared a military takeover in Pakistan.

The chief justice remarked that the alleged memo was given by Ijaz to Gen. James Johnson on May 10, 2011 and subsequently to Mullen, raising several questions over the country security. The court said that ISI collected evidences from Ijaz.

Earlier,  Nawaz Sharif  appeared before the court and argued his petition. Sharif while providing evidence in the absence of his lawyer, said that Ijaz had proved that the memo was written after the approval of a "higher authority in Pakistan." He said that scandals against the government are emerging one after the other and the people are ready to come out on the roads in protest.

Chaudhry remarked that "Memogate" is both of civil and criminal in nature and Parliament can review only civil matter.

Meanwhile, Pakistan, enraged by a NATO cross-border attack that killed 28 soldiers, could end support for the US-led war on militancy if its sovereignty is violated again, the foreign minister said, warning "enough is enough."

The South Asian nation has already shown its anger over the weekend strike by pulling out of an international conference in Germany next week on Afghanistan, depriving the talks of a central player in efforts to bring peace to its neighbor.

"Enough is enough. The government will not tolerate any incident of spilling even a single drop of any civilian or soldier's blood," The News reported Thursday quoting Foreign Minister Hina Rabbani Khar as telling a Senate Committee on Foreign Affairs, Reuters said. "Pakistan's role in the war on terror must not be overlooked."

Khar said, suggesting Pakistan could end its support for the US war on militancy. Despite opposition at home, Islamabad backed Washington after the Sept. 11, 2001, attacks on the United States.

The US Embassy released a video statement on YouTube by Ambassador Cameron Munter in which he expressed regret for the attack. (http://link.reuters.com/cyz35s)

"I would like to extend my most sincere condolences to the people and government of Pakistan, and especially to Pakistan's men and women in uniform, for the tragic incident that took place on Nov. 26 in Mohmand Agency," he said, standing in front of US and Pakistani flags.