ERBIL, Kurdistan Region of Iraq – The US will begin enforcing a blockade on ships entering or leaving Iranian ports on April 13, the US Central Command (CENTCOM) and US President Donald Trump said.

CENTCOM said in a statement late Sunday that its forces will start the operation at 10 am Eastern Time “in accordance with the President’s proclamation,” adding the measure will apply to “all maritime traffic entering and exiting Iranian ports and coastal areas.”

Trump said later in a Truth Social post on Monday that “the United States to Blockade Ships Entering or Exiting Iranian Ports on April 13 at 10:00 AM ET.”

According to CENTCOM, the enforcement will be “impartial” and include vessels of all nationalities, covering ports along the Arabian Gulf and Gulf of Oman.

The US military “will not impede freedom of navigation” through the Strait of Hormuz for ships traveling to or from non-Iranian ports, the statement added.

Trump said Sunday the United States will begin blockading ships in the Strait of Hormuz, accusing Iran of refusing to abandon its nuclear program after Pakistani-mediated talks in Islamabad failed to reach an agreement.

He said the US Navy would “blockade any and all ships” entering or leaving the strait, adding that other countries would join the effort.

The announcement followed over 21 hours of negotiations between Iran and the US in Islamabad, that ended without a deal, with disputes over Iran’s nuclear program, sanctions, war reparations, and control of the waterway.

Trump accused Iran of threatening shipping and imposing “illegal tolls,” saying vessels that comply with Tehran’s demands would be targeted, while warning that any attack by Iranian forces would trigger a strong military response.

The Strait of Hormuz carries about 20% of global oil supplies. The move comes amid a temporary ceasefire reached earlier in April that had reduced attacks across the region.