Turkey and Iran vowed to collaborate in their fight against terrorists in Iraq, as thousands of Turkish troops pressed ahead with an air and ground offensive against the militants in northern Iraq. Iranian Foreign Minister Ali Akbar Salehi claimed that the deaths of Turkish soldiers might have been avoided if the United States had informed Turkey that the terrorists were infiltrating into Turkey with heavy weaponry. The U.S. shares intelligence from surveillance drones with Turkey about movement of the PKK along the border.