A Twitter account Iran experts believe is run by the office of Supreme Leader Ayatollah Ali Khamenei said on Tuesday "arrogant" powers had tried hard to bring the Islamic Republic to its knees but had failed.
The US has accused two Iranians of planning to assassinate the Saudi Arabian ambassador to Washington.
Strong anti-United States salvos are heard regularly from Iran`s leadership.
Iran`s supreme leader Ayatollah Ali Khamenei blasted arch-foe Israel, Western powers and foreign media networks in a sermon on Sunday marking the Muslim festival of Eid ul-Fitr.
Day in Pics: 27th November
Showbiz World - November 27, 2014
Poonam Pandey: The internet sensation