Biden was asked on Wednesday whether he would support strikes against Iranian nuclear sites and the US president told reporters: "The answer is no."
Ayatollah Ali Khamenei's address in Tehran followed Iran's second-ever direct attack on Israel. It was also the first since exchanges of fire between Tehran-backed Hezbollah fighters and Israeli troops escalated into full-blown war in Lebanon.
Biden added that the Israelis "have not concluded how they're, what they're going to do" in retaliation for a huge ballistic missile attack by Iran on Israel on Tuesday.
As Israel weighs its options after its arch-foe Iran launched its largest ever assault on Tuesday, Biden was asked whether he would support Israel striking Iran's oil facilities.
All sides are aware that any retaliatory strike against Iran's nuclear or oil installations would send the Middle East spiralling even more towards chaos, but Israel seems not to have made a decision yet.
"Our action is concluded unless the Israeli regime decides to invite further retaliation," Iranian foreign minister said in a post on X early on Wednesday.
Iran rejected accusations that it is trying to kill Trump earlier this summer, shortly after a gunman opened fire at a rally in Pennsylvania, killing one person and wounding the presidential candidate.
One of the security officials said a large-scale operation is underway by the IRGC to inspect all devices, not just communication equipment. He said most of these devices were either homemade or imported from China and Russia.
Nasrallah and Hezbollah have thrived with an image of invincibility after confronting Israel in 2006.
A much-feted figure in world cinema, award-winning Iranian film director Abbas Kiarostami dies in Paris at 76.
Who can lay claim to Rumi, the Sufi mystic who is one of the world's most beloved poets? A bid by Iran and Turkey to do so has exasperated Afghanistan, country of his birth eight centuries ago.
The head of Iran's Revolutionary Guards has suggested there could be armed resistance in Bahrain after the Sunni Muslim-ruled kingdom's top Shia cleric was stripped of his citizenship.
Iranian billionaire businessman Babak Zanjani has been sentenced to death for corruption, justice officials say.
Iranians are voting in elections for their country's parliament and the Assembly of Experts, a clerical body that appoints the supreme leader.
Iran says it is cracking down on Valentine's Day celebrations and shops engaging in them will be guilty of a crime.
One should not be surprised if Washington re-establishes diplomatic ties with Tehran before the end of President Barack Obama's term in November 2016. However, what will be the fate of the JCPOA after the November 2016 US presidential elections is anyone's guess, particularly if a Republican is elected to the White House.
As soon as the international sanctions on Iran were lifted on January 16, the US Secretary of State John F Kerry said, “Today marks the start of a safer world.”
We welcome the lifting of the long-running international sanctions against Iran. It will certainly help the country to recover from the consequences...
Iran says new US curbs on the Islamic Republic's ballistic missile programme were illegitimate, vowing to continue developing its conventional military deterrent.