Iran shut down its internet to prevent images and videos leaking to the outside world, and to frustrate attempts by protesters to organise themselves.
Iran on Monday broke further away from its collapsing 2015 nuclear deal with world powers by announcing it's doubling the number of advanced centrifuges it operates.
Saudi Arabia's Aramco crude oil facilities in Abqaiq and Khurais were attacked on Sept. 14, cutting oil production by nearly six million barrels a day.
Britain has concluded that Iran was responsible for attacks on oil facilities in Saudi Arabia, U.K. Prime Minister Boris Johnson said Sunday.
As the United States and Israel escalate their push to contain Iranian influence in the Middle East, countries in Tehran's orbit are feeling the heat.
Iran: An attack over a drone-and-missile strike on Saudi Arabia's oil industry will result in "all-out war," further pushing up tensions.
Iran's supreme leader said that "there will be no talks with the U.S. at any level" – remarks apparently meant to end speculation about a possible upcoming meeting.
Iran acknowledged for the first time on Monday that a rocket at its Imam Khomeini Space Center exploded after satellite photos showed the blast last week.
Iran's president back-pedaled on possible talks with Donald Trump, saying the U.S. president must first lift sanctions imposed on Tehran.
The United States moved on Thursday to halt the release of an Iranian supertanker detained in Gibraltar for breaching EU sanctions on oil shipments to Syria.