By Phil Stewart and David LawderAug 31 (Reuters) - U.S. President Donald Trump posted an AI-generated video clip that he said showed Iran's oil hub Kharg Island being blown to smithereens, which an Iranian official dismissed as "laughable", just hours after both nations resumed hostilities for the first time since July.Several hours after the post, there was no evidence Kharg had been attacked.The White House and the U.S. Defense Department did not immediately respond to Reuters requests for comment outside regular business hours.

Iran responded to an earlier US attack on rocket launchers on its island of Larak, about 660km east of Kharg, with an assault on two US bases in Jordan, Iranian media said.

The president’s post comes as the U.S. military carried out its first major attack against Iranian forces in the Strait of Hormuz this month.

US President Donald Trump posted a message about Kharg Island amid rising tensions. US forces struck Iranian rocket launchers in the Strait of Hormuz. Iran responded by…