HANOI, Vietnam, July 11 (AP) Five people, including three children, died in central Vietnam when 30-year-old unexploded ordnance left behind from the Vietnam War exploded, police and state media reported Friday. Three boys, aged 12 to 14, were killed in an explosion Thursday in the Hai Lang district of Quang Tri province, said a district police officer. The boys discovered four unexploded bombs in bushes and the explosives went off when they examined them, he said. On Tuesday, two men were killed in the central highlands province of Kon Tum when an artillery shell they were cutting up for scrap metal exploded, the Tuoi Tre newspaper reported.