Vessels in the area are receiving repeated messages from the Islamic Revolution Guards Corps (IRGC) telling them that no ship is allowed to cross the strategic strait.
It comes as the Iranian Armed Forces continue retaliatory strikes against US and Israeli targets.
An informed source told Tasnim earlier that 14 American bases have so far been hit in the Iranian attacks.
The Islamic Revolution Guards Corps (IRGC) also announced that the US MST combat support warship has been heavily struck by missiles fired by the IRGC Navy forces.
It said other US naval assets will be within range of the IRGC missiles and drones in the ongoing attacks.