Iran on Tuesday denounced U.S. strikes a day earlier as a sign of "bad faith and unreliability" as negotiations continue toward a possible deal to end the war.

The U.S. military said it acted with restraint in defensively targeting missile launch sites and boats placing mines. Iran's foreign ministry called the strikes a ceasefire violation and warned that "The Islamic Republic of Iran will leave no act of aggression unanswered."

READ MORE: U.S. says it carried out 'self-defense' strikes in Iran, including missile sites and boats placing mines

Iran's Revolutionary Guard on Tuesday said it had shot down and deterred drones and a fighter jet that entered its airspace, according to Iran's official Mizan news agency, which did not say when this happened.

Iranian parliament speaker Mohammad Bagher Qalibaf went to Qatar as part of the talks. The U.K. Maritime Trade Operations Center said an explosion was reported Tuesday morning aboard a tanker in the Gulf of Oman. No one was injured and there was no immediate information on the cause.