Iran launched fresh attacks across the Middle East on Monday and threatened "devastating" retaliation, after U.S. President Donald Trump's expletive-laced warning that Tehran must reopen the Strait of Hormuz.

An Israeli strike targeted an apartment in a residential building in Ain Saadeh on Sunday, a town east of Beirut in the hills overlooking the city, the state-run National News Agency reported.

The area had until now been spared clashes between Hezbollah and Israel, which on Sunday stepped up its strikes on the Lebanese capital's southern suburbs, including an attack that killed four people near Beirut's main public hospital.

Israel's military chief Eyal Zamir visited troops in southern Lebanon on Sunday and pledged to intensify strikes against Hezbollah.

U.S. President Donald Trump on Sunday appeared to extend by 24 hours his deadline for Iran to make a deal to reopen the Strait of Hormuz or face devastating infrastructure attacks.

U.S. President Donald Trump said Sunday he believes there is a "good chance" of making a deal with Iran on Monday, ahead of his deadline for Tehran to reopen the Strait of Hormuz or face heavy bombing.

Israeli strikes on south Beirut and its suburbs killed at least four people on Sunday, a day after Israel threatened to hit Lebanon's main border crossing with Syria, forcing it to close.

President Joseph Aoun hit back Sunday at those who have criticized the Lebanese state for pursuing diplomacy and negotiations.

Hezbollah on Sunday said it had targeted an Israeli warship with a cruise missile off the Lebanese coast, the first such claim by the group since the start of the Middle East war.

U.S. President Donald Trump said Sunday that U.S. forces had safely recovered a second airman downed in Iran, calling it "one of the most daring Search and Rescue Operations in U.S. History".

U.S. President Donald Trump said that "many" of Iran's military leaders were killed in a huge strike on the Islamic republic's capital.