At least two army soldiers have been killed as unknown armed miscreants opened fire on an army vehicle which was on its way in G-11 Sector in Islamabad, rescue sources said early on Thursday morning. Some top officials of the government live in the locality. Police high officials reached to the place of the incident. Authorities have declared red alert after the shooting incident. According to some accounts the attackers were pedestrians and fled to nearby gullies after the attack. Police have launched search in the area with search dogs. All the police checkposts, located nearby, have been put on high alert, meanwhile, the investigation into the incident has commenced, sources said.