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Iran protested the United States and United Kingdom for their alleged roles in the assassination of Iranian nuclear scientist Mostafa Ahmadi Roshan Wednesday, implicating the two nations in the attack, the official Iranian Republic News Agency (IRNA) reported Saturday.Iran sent a letter to the Swiss embassy in Tehran - the only official diplomatic channel between Iran and the United States in Iran - saying that CIA-led operations in the Islamic Republic are known, and blaming the US for supporting "terrorist groups against Iran."Tehran also sent a letter to the British Foreign Office, claiming British intelligence aided in the killing of the 32-year-old Roshan with a car bomb.The letter cited Foreign Intelligence Service Head (MI6) John Sawers, who said the UK was beginning intelligence operations against Iran, according to IRNA.Iran demanded a response from both governments.The Islamic Republic has blamed the violent death of Roshan on the CIA, Israel and now MI6. US Secretary of State Hilary Clinton summarily denied the charges and Israeli President Shimon Peres said that Israel had no role in the attack, to the best of his knowledge.Roshan is the fourth Iranian scientist to be killed since 2007.IDF Chief of General Staff Lt.-Gen. Benny Gantz said Tuesday that "2012 will be a critical year in the connection between Iran gaining nuclear power, changes in leadership, continuing pressure from the international community and events that happen unnaturally."