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Trump said he would put off deciding for two weeks whether to join Israel鈥檚 air campaign against Iran. U.S. participation would most likely involve strikes against Iran鈥檚 underground Fordo uranium enrichment facility, considered to be out of reach to all but America鈥檚 鈥渂unker-buster鈥� bombs.

Whether or not the U.S. joins, Israeli Prime Minister Benjamin Netanyahu said Israel鈥檚 military operation in Iran would continue 鈥渇or as long as it takes鈥� to eliminate what he called the existential threat of a nuclear-armed Iran.

As negotiations ended in Switzerland, European officials expressed hope for future negotiations. Iran鈥檚 top diplomat said he was open to further dialogue.

However, Foreign Minister Abbas Araghchi emphasized that Tehran had no interest in negotiating with the U.S. while Israel continued attacking. 鈥淚ran is ready to consider diplomacy if aggression ceases and the aggressor is held accountable for its committed crimes,鈥� he told reporters.

No date was set for the next round of talks.

Iran previously agreed to limit its uranium enrichment and allow international inspectors in to its nuclear sites under a 2015 deal with the U.S., France, China, Russia, Britain and Germany in exchange for sanctions relief.

After Trump pulled the U.S. unilaterally out of the deal during his first term, Iran began enriching uranium up to 60% 鈥� a short, technical step away from weapons-grade levels of 90% 鈥� and restricting access to its facilities.

Even with negotiations in Geneva underway, Iran kept up its strikes on Israel. Missiles crashed into the northern city of Haifa, sending plumes of smoke billowing over the Mediterranean port and wounding at least 19 people.

The war between Israel and Iran erupted June 13, with Israeli airstrikes targeting nuclear and military sites, top generals and nuclear scientists.

At least 657 people, including 263 civilians, have been killed in Iran and more than 2,000 wounded, according to a Washington-based Iranian human rights group.

Iran retaliated by firing 450 missiles and 1,000 drones at Israel, according to Israeli army estimates. Most have been shot down by Israel鈥檚 multitiered air defenses, but at least 24 people in Israel have been killed and hundreds wounded.

The U.S. evacuated 79 staff and families from the U.S. Embassy in Israel on Friday. An internal State Department memo said the military flight, the second known to have occurred this week, left Tel Aviv for Sofia, Bulgaria, where some or all of the passengers were to get a connecting charter flight to Washington.

The document, obtained by The Associated Press, also said more than 6,400 U.S. citizens in Israel filled out an online form on Friday alone asking for information about when and if the U.S. government would organize evacuation flights. An additional 3,265 people, some of whom may also have competed the form, called an emergency number seeking assistance.

The risk of attacking reactors

Addressing an emergency meeting of the U.N. Security Council, the head of the International Atomic Energy Agency appealed for a halt to the fighting and warned against attacks on Iran鈥檚 nuclear reactors, particularly its only commercial nuclear power plant in the southern city of Bushehr.

鈥淚 want to make it absolutely and completely clear: In case of an attack on the Bushehr nuclear power plant, a direct hit would result in a very high release of radioactivity to the environment,鈥� said Rafael Grossi, chief of the U.N. nuclear watchdog. 鈥淭his is the nuclear site in Iran where the consequences could be most serious.鈥�

Israel has not targeted Iran鈥檚 nuclear reactors, instead focusing its strikes on the country鈥檚 uranium enrichment sites 鈥� including the country鈥檚 main enrichment site at Natanz, centrifuge workshops around Tehran and a nuclear site in Isfahan.

Grossi also warned of the risks associated with attacking those nuclear sites, saying Israel鈥檚 attacks on Natanz caused some radiological and chemical contamination.

But the watchdog reported that radiation levels outside the Natanz facility remain normal, as the risks of contamination are lower at enrichment sites.

鈥淎 diplomatic solution is within reach if the necessary political will is there,鈥� Grossi said.

Iran maintains its nuclear program is for peaceful purposes, but it is the only non-nuclear-weapon state to enrich uranium up to 60%. Israel is widely believed to be the only Middle Eastern country with a nuclear weapons program but has never acknowledged it.

Israel hits Iran鈥檚 missile production

Dozens of Israeli warplanes struck targets across the country early Friday, including industrial sites in the north, missile storage and launchers in the west and the headquarters of an advanced research institute in Tehran.

The U.S in the past linked that institute, known by its acronym SPND, to alleged Iranian research and testing tied to the possible development of nuclear explosive devices.

Iranian state media reported explosions as a result of Israeli strikes in an industrial area of Rasht, along the coast of the Caspian Sea in northern Iran, but did not acknowledge hits to the other sites.

鈥淲e are strengthening our air control in the region and advancing our air offensive,鈥� Israeli military spokesperson Brig. Gen. Effie Defrin told reporters.

The military warned the public to evacuate the area around Rasht鈥檚 Industrial City, southwest of the city鈥檚 downtown. With Iran鈥檚 internet shut off to the outside world for more than 48 hours, it鈥檚 unclear how many people saw the message.