Afghan and coalition troops found and destroyed 2.5 tons of marijuana in an abandoned school in southern Afghanistan, while coalition troops killed four insurgents elsewhere in the south, officials said Sunday. The marijuana, which was stored in 2-feet (0.6-meter) tall stacks, filled several rooms of the abandoned school in the Arghistan district of the southern province of Kandahar, a statement from U.S. forces in Afghanistan was quoted as saying by Associated Press. Col. Jerry O'Hara, a U.S. military spokesman, said using a school as a drug warehouse «is an attack on the future of all Afghanistan.» In Zabul province, meanwhile, coalition forces killed four armed militants and detained five suspects during an operation Saturday, the coalition said.