The Colombian army says it has installed a giant Christmas tree in Farc rebel territory, to encourage guerrilla fighters to demobilize. Special forces infiltrated the remote Macarena mountain range to dress a 25m (82 ft) high tree with 2,000 lights. Movement sensors will make the tree light up when guerrillas approach. The army says it will put up trees in nine other rebel-held zones to spread the message that Christmas is a good time to abandon armed struggle. The Colombian government says more than 2,000 guerrillas demobilized this year under a scheme that gives them amnesty and help to return to civilian life. "Operation Christmas," as it was code named, was carried out by elite troops using Blackhawk helicopters.