The incident occurred at the entrance to the Strait of Hormuz.
The crew is safe, but the attack is reported to have caused extensive damage to the container ship's bridge.
According to the Iranian news agency Tasnim, the ship, which was sailing under the Liberian flag, ignored "warnings" from Iranian forces. The Revolutionary Guard is threatening further attacks.
"The Revolutionary Guard (...) is ready to decisively, definitively and immediately confront any threat," they said in a statement on Wednesday.
On Friday, Iranian Foreign Minister Abbas Araghchi announced that the Strait of Hormuz had reopened. The following day, the Revolutionary Guards declared the waterway closed again, citing the US blockade of Iranian ports.
