KABUL (Agencies) - At least 16 Taliban were killed in US-led airstrikes carried out by pilotless aircraft in southern Afghanistan, the Nato-led International Security Assistance Force (Isaf) said Tuesday. Nato pinpointed a group of insurgents who were moving mortar rounds and ammunition Monday near a safehouse in Helmand province, the Isaf said in a statement. An unmanned aerial vehicle launched one Hellfire missile, killing 13 insurgents, it said, adding that there were no reports of civilian casualties in the Naw Zad district, where the incident took place. Three other insurgents were killed Monday in another drone attack in the Nad Ali district of the same province, the statement said. Also on Monday, an unknown number of 'known insurgents were killed by Afghan and international forces in the western province of Herat, it said. The targeted militants were linked to roadside bombings in the region, it said without giving any details on the operation.