RIYADH: Saudi Arabia's top religious official warned on Thursday Saudis and foreigners living in the kingdom not to hide information about militants in the world's largest oil exporter.nnThe statement from Grand Mufti Sheikh Abdul-Aziz Al al-Sheikh follows a government announcement last week that it is holding 520 suspects, arrested since January, who planned car bomb attacks against oil and security installations.nn"I warn citizens and residents from concealing them and giving them shelter, this would be a great sin," the statement carried by the official Saudi Press Agency said.nnHis comments form part of an ongoing publicity campaign against militant ideology in the kingdom.nn"Aggressions against Muslims and occupation of land ... cannot be a justification for explosions, denouncing other Muslims as infidels and disobeying the Muslim social consensus," the government-appointed mufti said.