The U.S. and Iran failed to reach a peace deal after 21 hours of negotiations.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes targeting military and government sites.
Trump set a deadline for Iran to fully reopen the Strait of Hormuz or face broad strikes on its critical infrastructure. Hours before the deadline expired, Trump said he had agreed to suspend planned bombing for two weeks if Iran agreed to reopen the Strait of Hormuz.
Iranian Foreign Minister Abbas Araghchi then said that "safe passage through the Strait of Hormuz will be possible via coordination with Iran's Armed Forces and with due consideration of technical limitations."
Israeli Prime Minister Benjamin Netanyahu said he supported the ceasefire with Iran, but that Lebanon -- where intense Israeli strikes continued -- was not covered by the agreement, despite Iranian protests.
The Israel Defense Forces said in a post to X on Tuesday that it "completed a wide-scale wave of strikes targeting dozens of infrastructure sites" in several areas of Iran.
Iran's Deputy Minister of Sports and Youth Alireza Rahimi invited people to form human chains around the country's power plants in a video message published on Monday, according to the government's Telegram channel.
Rahimi called on young people, artists, athletes, students and professors to join the initiative -- which he described as a "symbolic move" -- on Tuesday at 2 p.m. local time (6:30 a.m. ET), regardless of their political views, to protect infrastructure he referred to as "national assets that belong to the future of Iran and its young people."
The invitation came as President Donald Trump's Tuesday evening deadline for Iran to fully re-open the Strait of Hormuz approached. Trump has threatened to destroy Iranian civilian infrastructure -- including power plants and bridges -- if Tehran does not comply.
Israeli attacks on Iranian infrastructure, meanwhile, have intensified across the country.
-ABC News' Somayeh Malekian and Joe Simonetti
Photos provided by the United Nations Interim Force in Lebanon to ABC News on Tuesday showed recent damage to the force's headquarters in Naquora, southern Lebanon, amid fighting between Israeli forces and the Iran-backed Hezbollah militant group.
In particular, some of the images show security cameras outside the headquarters that UNIFIL says Israeli soldiers intentionally destroyed last week.
Kandice Ardiel, spokesperson for UNIFIL, said in posts to X last week that the force "expressed our serious concern about this to the Israel Defense Forces and will formally protest their actions. We remind them of their obligation to ensure the safety and security of United Nations personnel and to respect the inviolability of UN premises."
-ABC News' Morgan Winsor
Israel's Magen David Adom emergency service reported missile fire toward central Israel in a post to X on Tuesday.
MDA shared photos and videos from the scene showing apparent damage from the attack. The MDA did not specify whether the damage was caused by a missile impact or debris from an interception.
