BAGHDAD, April 22, SPA -- An unmanned drone killed two gunmen in Baghdad's Sadr district, while anotherremote-controlled aircraft crashed south of the capital,the U.S. military said Tuesday. Militiamen also have responded by repeatedly shellingBaghdad's U.S.-protected Green Zone, which houses the U.S. Embassy and offices of the Iraqi government, the Associated Press reported.--SPA www.spa.gov.sa/548628