CAIRO, EGYPT - In a new video posted Thursday on the Internet, an al-Qaida militant who escaped from a U.S. prison in Afghanistan urged Sunni militants in Iraq to join the terror group and claimed the U.S. military's security plan for Baghdad has failed. Abu Yahia al-Libi, who broke out of the U.S. prison at Bagram Air Base north of Kabul in 2005, said it was the sacred duty of all mujahedeen, or holy warriors, to "stand steadfast together." He called on militant groups known as Ansar al-Sunnah, the Islamic Army in Iraq and the Army of the Mujahedeen to...