Israel and Iran traded fire early Monday in retaliatory strikes that threatened to drag the wider Middle East back into a full-scale regional war, while Yemen's Houthi rebels also fired at Israel and warned they would target Israel-affiliated ships in the Red Sea, further escalating tension.
Israel launched strikes on central and western Iran early Monday in response to missile fire from Tehran and Iran retaliated with waves of attacks, in the most serious crossfire since an April 8 ceasefire was reached.
Explosions could be heard in central Israel as air defences sought to intercept incoming Iranian fire.
Iran's paramilitary Revolutionary Guard said it had targeted two military bases in Israel, describing the attacks as being part of Operation Nasr, or "Victory." The Guard said it launched the missiles after Israel targeted radar sites in three areas of Iran.
Tehran warned of retaliation on Sunday after Israel struck Beirut's southern suburbs without warning in defiance of Washington's request days ago to stand down.
Monday marked the 100th day of the Iran war, launched February 28 when Israel and the United States killed Supreme Leader Ayatollah Ali Khamenei and other senior Iranian leaders.
The war raged until the two sides reached a nominal ceasefire on April 8, but a permanent end to the hostilities have been challenged by Iran's chokehold on the Strait of Hormuz, through which a fifth of all traded oil and natural gas once passed in peacetime, as well as fighting between Israel and the Lebanese Shiite militia Hezbollah.
With global energy supplies threatened, Iran still holding a vast stockpile of highly enriched uranium and even Yemen's Houthi rebels apparently getting involved in the fighting Monday, the risks of the war fully erupting again appears to be rising.
Israel strikes Iran
Iranian state television reported the sound of explosions being heard in Isfahan, Karaj, Tabriz and Tehran, without immediately elaborating. A witness in Tehran described hearing at least one large blast somewhere to the west of the country's capital city.
Iran closed the airspace around Tehran's Imam Khomeini International Airport, the country's main airfield, after the Israeli attack.
Officials offered no details on what had been struck, nor any damage information. Iran's paramilitary Revolutionary Guard said that Israel used air-launched ballistic missiles in its attack Monday morning, without elaborating.
The semiofficial Fars and Mehr news agencies said Israeli strikes had hit a petrochemical factory in the city of Mahshahr in Khuzestan province. It did not elaborate on damage.
The Israeli military later confirmed the strike on the petrochemical plant.
Earlier Monday, sirens sounded across Israel after its military said a missile launched from Yemen targeted the country, without elaborating. Israel's rescue services said there were no reports of casualties or impacts from the launch from Yemen.
Yemen is home to the Iranian-backed Houthi rebels. The Houthis have fired missiles at Israel during the Israel-Hamas war and later, but haven't been fully involved in the Iran war. The Houthis did not immediately claim the attack, though it can take them hours or even days to acknowledge their assaults.
In Saudi Arabia, missile alert sirens sounded Monday morning in an area home to an air base that hosts US forces.
Saudi state media reported the alert around its Al Kharj governorate, home to Prince Sultan Air Base. The alert came after Israel's strikes on Iran. Saudi Arabia shortly after said the missile danger in the area had passed, without elaborating.