NEAR SAMAWA, Iraq, April 30 (Reuters) - Investigators have uncovered a mass grave in southern Iraq containing as many as 1,500 bodies, most of them thought to be Kurds forcibly removed from their homes in the late 1980s. The site, near the town of Samawa, about 300 km (180 miles) south of Baghdad, consists of 18 shallow trenches dug by earth-moving vehicles into hard limestone rock. Most of the victims were women and children who were apparently lined up in front of the pits and shot with AK-47 assault rifles, according to a U.S. investigator. Around 110 bodies have been...