Mr Rubio told _Breitbart News_ that an average of 13 million to 14 million barrels of non-Iranian oil had been passing through the strait daily over the preceding 10 days, with volumes equal to prewar levels on some days.
The Iran-backed group said it had also carried out attacks on a Saudi naval task-force camp and a Saudi radar in Bir Askar.
Here is a breakdown of the practical steps involved and the debate unfolding in the country with the Arab world's largest population and largest army.
Iran’s Islamic Revolutionary Guard Corps has said early this morning that an oil tanker struck a naval mine and caught fire in the southern Strait of Hormuz.
They discussed their shared commitment to "further strengthening co-operation and coordination across various fields in a manner that serves their mutual interests and benefits their peoples".