The announcement is said to be a response to Israel's continued attacks on Lebanon.
According to sources close to the Iranian Revolutionary Guard Corps, Tasnim reports that Iran and its allies have decided to completely block the Strait of Hormuz and also "activate other fronts, including the Bab al-Mandab Strait."
The Bab al-Mandab Strait off Yemen forms the southern gateway to the Red Sea and is a vital shipping route for global trade. Iran has also previously threatened to draw the Iran-backed Houthi movement in Yemen into the conflict.
During the ongoing peace negotiations with the US, Iran's delegation has repeatedly demanded that an agreement must also include an end to the war in Lebanon.
In parallel, Israel has escalated its attacks against Iran-backed Hezbollah in Lebanon, with regular strikes on both the south of the country and the capital, Beirut.
"As long as the position of Iran and its allies on this is not met, no talks will take place," Tasnim writes on X.
