Unconfirmed news from intelligence sources said on Monday that five Pakistan Taliban ( TTP) leaders were arrested Monday morning in the Gorvait area of North Waziristan by NATO forces and later taken away by two NATO helicopters to Afghanistan.

According to the sources who asked to remain anonymous, the action was taken by the NATO forces without informing the Pakistani government. If so, this is another Abbottabad-like operation taken by the foreign forces on the Pakistani soil without the knowledge of the Pakistani side.

Political agent of North Waziristan also confirmed the news.

So far, there is no official report about the Monday morning's operation taken by the NATO forces in North Waziristan, a tribal area in northwest Pakistan, which is believed to be a stronghold of militants in the country, who often launch attacks on the NATO forces in Afghanistan across the border.

On May 2, the U.S. forces conducted a raid in Pakistan's northwestern city of Abbottabad, during which the former al-Qaida chief Osama bin Laden was killed in his compound. As the U.S. side did not inform the Pakistani side until the raid was over, it led to a strong protest from the Pakistani side as Pakistan considers the unilateral action taken by the United States has seriously violated its sovereignty.