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President Donald Trump said Saturday that the U.S. military struck three sites in Iran, directly joining Israel ’s effort to decapitate the country's nuclear program in a risky gambit to weaken a longtime foe amid Tehran’s threat of reprisals that could spark a wider regional conflict.There was no immediate acknowledgment from Iran of any strikes being carried out. The decision to directly involve the U.S. in the war comes after more than a week of strikes by Israel on Iran that aimed to systematically eradicate the country’s air defenses and offensive missile capabilities, while damaging its nuclear enrichment facilities. But U.S. and Israeli officials have said that American stealth bombers and the 30,000-pound (13,500-kilogram) bunker buster bomb they alone can carry offered the best chance of destroying heavily fortified sites connected to the Iranian nuclear program buried deep underground.Here’s a look at some major Iranian sites and their importance in Tehran’s program.Natanz enrichment facilityIran’s nuclear facility at Natanz, located some 135 miles southeast of Tehran, is the country’s main enrichment site.Part of the facility on Iran’s Central Plateau is underground to defend against potential airstrikes. It operates multiple cascades, or groups of centrifuges working together to more quickly enrich uranium.Iran also is burrowing into the Kūh-e Kolang Gaz Lā, or Pickax Mountain, which is just beyond Natanz’s southern fencing. Natanz has been targeted by the Stuxnet virus, believed to be an Israeli and American creation, which destroyed Iranian centrifuges. Two separate sabotage attacks, attributed to Israel, also have struck the facility. Fordow enrichment facilityIran’s nuclear facility at Fordow is located some 60 miles southwest of Tehran. It also hosts centrifuge cascades, but isn’t as big a facility as Natanz.Buried under a mountain and protected by anti-aircraft batteries, Fordo appears designed to withstand airstrikes.Its construction began at least in 2007, according to the International Atomic Energy Agency, although Iran only informed the U.N. nuclear watchdog about the facility in 2009 after the U.S. and allied Western intelligence agencies became aware of its existence. Bushehr nuclear power plantIran’s only commercial nuclear power plant is in Bushehr on the Persian Gulf, some 465 miles south of Tehran. Construction on the plant began under Iran’s Shah Mohammad Reza Pahlavi in the mid-1970s. After the 1979 Islamic Revolution, the plant was repeatedly targeted in the Iran-Iraq war. Russia later completed construction of the facility.Iran is building two other reactors like it at the site. Bushehr is fueled by uranium produced in Russia, not Iran, and is monitored by the United Nations’ International Atomic Energy Agency.Arak heavy water reactorThe Arak heavy water reactor is 155 miles southwest of Tehran. Heavy water helps cool nuclear reactors, but it produces plutonium as a byproduct that can potentially be used in nuclear weapons. That would provide Iran another path to the bomb beyond enriched uranium, should it choose to pursue the weapon. Iran had agreed under its 2015 nuclear deal with world powers to redesign the facility to relieve proliferation concerns. Isfahan Nuclear Technology CenterThe facility in Isfahan, some 215 miles southeast of Tehran, employs thousands of nuclear scientists. It also is home to three Chinese research reactors and laboratories associated with the country’s atomic program.Tehran Research ReactorThe Tehran Research Reactor is at the headquarters of the Atomic Energy Organization of Iran, the civilian body overseeing the country’s atomic program. The U.S. actually provided Iran the reactor in 1967 as part of America’s “Atoms for Peace” program during the Cold War. It initially required highly enriched uranium but was later retrofitted to use low-enriched uranium over proliferation concerns.