Iran's Foreign Minister Mohammad Javad Zarif has flatly dismissed a US allegation that Iran was responsible for Thursday's attacks on two tankers in the Gulf of Oman.

Zarif posted a comment on Twitter on Friday after US Secretary of State Mike Pompeo blamed Iran for the attacks.

Zarif wrote, "The US immediately jumped to make allegations against Iran without a shred of factual or circumstantial evidence."

He added, "the B Team is moving to a Plan B: Sabotage diplomacy - including by Japanese Prime Minister Shinzo Abe - and cover up its economic terrorism against Iran".

Zarif has previously referred to US National Security Advisor John Bolton, who is known for his hawkish views on Iran, as a member of the B Team, along with the leaders of Israel and Saudi Arabia.

NHK