Iranian gunboats fired on two ships in the Strait of Hormuz on Wednesday as Tehran maintained its grip on the vital energy channel, while two of its own oil supertankers tested a US blockade.

The morning assault by Iran's paramilitary Revolutionary Guard came after U.S. President Donald Trump indefinitely extended the ceasefire.

On Saturday, Iran's Islamic Revolutionary Guard Corps (IRGC) said in a statement that the Strait of Hormuz was shifted back to how it operated before April 17, putting the passage under tighter

Iran fired on three ships in the Strait of Hormuz on Wednesday, underscoring the ongoing threat to global energy supplies and complicating efforts to bring the United States and Iran together for talks to end the war.

Two regional officials said Tuesday that the United States and Iran have signaled they will hold a new round of ceasefire talks in Islamabad as a fragile two-week truce was due to expire.

U.S. President Donald Trump said Tuesday he is extending the ceasefire with Iran at Pakistan’s request while awaiting a “unified proposal” from Tehran, even as the U.S. military maintains its blockade of Iranian ports.

The U.S. Navy’s seizure of an Iranian-flagged cargo ship has cast doubt on President Donald Trump’s announcement of a second round of talks with Iran

Trump is extending a ceasefire with Iran at Pakistan's request. The announcement came as a two-week truce was set to expire Wednesday.