India, April 5 -- US President Donald Trump on Sunday appeared to extend his self-imposed deadline for Iran by 24 hours to make a deal to reopen the Strait of Hormuz or face devastating infrastructure attacks.

In a cryptic post on Truth Social, Trump gave the new deadline, Tuesday, 8 PM ET.

"Tuesday, 8:00 P.M. Eastern Time!" he said in the post.

The new deadline, 0000 GMT or 5:30 AM Wednesday, would mean another day for Tehran to attempt to placate the mercurial US leader or risk him following through on a threat to destroy the country's power plants and bridges, the threat of which the Islamic Republic has called a "war crime".

Iran has effectively blocked the Strait of Hormuz shipping lane, a vital route for the world's oil and gas,...