State Department tells Americans worldwide to 'exercise increased caution'

The Iranian military said on Sunday that Tehran would seek to retaliate against U.S. energy sites and infrastructure in the Gulf region if Washington moves to strike Iranian power plants, according to Fars News Agency, a semi-official state news agency affiliated with Iran’s Islamic Revolutionary Guard Corps.

Trump said on Saturday that the U.S. would "hit and obliterate" Iranian power plants if the Strait of Hormuz wasn’t opened within 48 hours

"If Iran’s fuel and energy infrastructure is attacked by the enemy, all energy infrastructure, as well as information technology (IT) and water desalination facilities, belonging to the U.S. and the regime in the region will be targeted pursuant to previous warnings," said Lt. Col. Ebrahim Zolfaqari, a spokesperson for the Iranian Armed Forces, according to Fars.

The near-total internet blackout in Iran entered its 23rd day early on Sunday, according to NetBlocks, a web monitoring organization.

"The measure adds to the wartime distress of millions of civilians who lack independent sources of information and alerts," NetBlocks said.

A shell launched from Lebanon into northern Israel resulted in damage, the Israel Defense Forces said on Sunday.

"The incident is under investigation," an IDF spokesperson said. Israel has been targeting infrastructure related to Hezbollah, an Iranian proxy, in southern Lebanon.

Israel's first responders said two vehicles had caught fire near the border, adding in an update that there appeared to be someone "trapped in a vehicle, showing no signs of life."

President Donald Trump said the U.S. will "hit and obliterate" Iranian power plants if the Strait of Hormuz isn't opened within 48 hours

"If Iran doesn’t FULLY OPEN, WITHOUT THREAT, the Strait of Hormuz, within 48 HOURS from this exact point in time, the United States of America will hit and obliterate their various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!" Trump said in a post on his social media platform.

The largest power plant in Iran is thought to be the Damavand Combined Cycle Power Plant — which is located in the outskirts of the capital city Tehran.

Iran has effectively blocked the Strait of Hormuz -- a narrow waterway off Iran’s southern coast that normally handles about 20% of global oil consumption -- since the start of the war.

Trump's post came as he floated on Friday that he was considering "winding down" the U.S.'s military campaign, claiming the U.S. was "very close to meeting our objectives."

Trump also said Friday that the U.S. would "help" Gulf states secure and police the Strait of Hormuz "if asked."