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."

Israel's MDA service said Saturday that 64 people were injured in an Iranian attack on the city of Arad in southern Israel.

Of those wounded, seven patients were in serious condition and 15 patients in moderate condition, according to MDA.

IDF Spokesperson Effie Defrin said the hits in Arad and earlier in Dimona on Saturday were direct missile strikes.

"The air defense systems were activated but did not intercept the missile. We will investigate the incident and learn from it," he said.

-ABC News' Dana Savir and Victoria Beaule

Iranian Foreign Minister Seyed Araghchi on Sunday reiterated the Iranian message that the Strait of Hormuz "is not closed" as President Trump imposed a deadline for Iran to stop its attacks on the strait or face strikes on energy infrastructure.

"Strait of Hormuz is not closed. Ships hesitate because insurers fear the war of choice you initiated — not Iran," Araghchi wrote on X. "Ships hesitate because insurers fear the war of choice you initiated — not Iran. No insurer — and no Iranian — will be swayed by more threats. Try respect."

"Freedom of Navigation cannot exist without Freedom of Trade. Respect both — or expect neither," Araghchi further said in his Sunday post.

"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 Saturday.

-ABC News' Victoria Beaule