Iran's state-run news agency is reporting that Iran sent an official warning through Swiss diplomats to the U.S. that any action taken against Tehran "will face an immediate answer."
That's according to a report Wednesday by the IRNA news agency.
It said that Iran sent the diplomatic note to the Swiss on Monday. The Swiss Embassy has looked after America's interests in Iran for decades.
There was no immediate reaction from U.S. diplomats.
The note also reiterated that Iran says it has nothing to do with Saturday's attack on oil installations in Saudi Arabia. While Yemen's Iranian-backed Houthi rebels have claimed the assault, the U.S. has alleged Iran was behind it.
Iranian President Hassan Rouhani says Saudi Arabia should see the attack this weekend on its oil facilities as a warning to end its Yemen war.
Rouhani made the comments at a Cabinet meeting on Wednesday in Tehran.
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In the video released by state TV, Rouhani did not address U.S. and Saudi allegations that Iran was behind the attack Saturday.
A Saudi-led coalition has been battling Yemen's Iranian-backed Houthi rebels since March 2015.