Colombia has restricted the importation of drones, whose increased use by guerrilla groups in a decades-old conflict killed 20 people last year and wounded nearly 300, the government said Thursday. Guerrillas fighting the state, as well as rival rebel and drug trafficking groups, have taken to fixing explosives to commercial drones and targeting soldiers and civilians alike. Advertisement AdvertisementAdvertisement AdvertisementLast year, there were 8,000 such attacks, according to Defense Minister Pedro Sanchez. The new measures stipulate that drones may only enter through customs points at Bogota's international airport and the northern seaport of Cartagena. The Colombian military believes the ELN and other guerrilla groups received training to use drones in explosives attacks from foreign armed entities.