Faced with the real threat of terrorist attacks during Iraqi elections next month, U.S. military officials tell NBC News the Pentagon is now planning to raise the number of American troops in Iraq by 10,000-11,000 to provide additional security. That's twice the number of needed reinforcements first anticipated and will temporarily raise the number of U.S. troops in Iraq to about 150,000. That also means soldiers from the Army's 1st Infantry and 1st Cavalry and some U.S. Marines who were scheduled to leave Iraq this month may be ordered to stay longer, while soldiers from the 3rd Infantry and 82nd Airborne could be ordered into Iraq earlier than scheduled. Even then, it would seem impossible to protect all 9,000 polling places in Iraq from terrorist attack.