Three members of Algerian security forces and an Islamic gunman were killed and two civilians were kidnapped by armed groups, officials said Monday. A security source said Monday that a land mine planted by Islamic armed groups blew up under a police vehicle in the province of Galfa, 187 miles south of Algiers, killing two policemen and injuring three others. In another incident, army troops clashed with Islamist gunmen as they were patrolling an area in the same province Saturday. A soldier and a gunman were killed. The source said an armed group kidnapped two civilians at a roadblock in the province of Boumedras in eastern Algeria. The gunmen posing as security forces snatched the men from their car and took them to an unknown destination.