U.S. forces have arrested the two leaders of the network believed responsible for the brazen raid in Karbala by terrorists disguised as Americans, in which five U.S. soldiers were kidnapped and later killed in January, U.S. military officials said today. In operations over the past several days in Basra and Hillah, coalition forces captured Qais Khazali, his brother Laith Khazali and several other members of the Khazali network, a splinter faction of the Mahdi army. Senior U.S. military sources tell ABC News that hard evidence linking the Khazalis to the Karbala raid, including the ID cards of several of the...