Claude Moniquet, president of the European Strategic Intelligence and Security Center, a private think-tank in Brussels, said his organization also had evidence Tehran has increased numbers of intelligence agents across Europe.
Parliament's intelligence and security committee, a panel of lawmakers which reviews work of Britain's MI5 and MI6 domestic and foreign spy agencies, also warned last year of an "increased threat to U.K. interests from Iranian state-sponsored terrorism."
Iran insists it is engaged in a civilian power program. The United States and its allies claim it is a cover for the covert development of nuclear weapons.