NATO said Friday it captured several insurgent leaders in recent days and detained at least 438 suspected militants over the last month, as three coalition soldiers were killed in southern Afghanistan. Afghan and coalition forces also killed at least 15 insurgents in a firefight in eastern Kunar province who were trying to set up an attack position, AP quoted the coalition as saying. It said initial reports indicated there were no injuries to civilians. NATO said Afghan and international forces captured a senior Taliban leader based in the Panjwai district of Kandahar province Thursday. A military operation called «Dragon Strike» is under way in Kandahar, the heartland of the Taliban insurgency, to clear the area of militants. The captured Taliban leader helped militants obtain weapons and bomb components and provided training and bed-down locations for the Taliban leadership, NATO said. It said the security force did not fire its weapons in taking the leader into custody. NATO also said that Afghan and coalition security forces captured a Haqqani Network operative involved in explosive attacks and providing support to Taliban insurgents. He was captured in Khost, in the east near Pakistan, on Thursday. The Haqqani Network is based in Pakistan and is believed to have links to al-Qaida. NATO said in a statement that the suspect was detained along with three of his associates. The security force found an automatic weapon, ammunition and a hand grenade at the scene, it said.