Tehran, Iran - Iran and the US traded threats on Wednesday after some of the heaviest military exchanges in weeks, including a strike on a wedding party that Tehran blamed on Washington and branded a "war crime."

President Donald Trump said US forces staged a "very heavy attack" on Iranian targets overnight and are "prepared to do another one any time we want."

Iran's security chief warned that the US would face a "new strategy" in the war that began in late February with US and Israeli attacks on the Islamic Republic.

"You will soon see that Iran's new strategy on the battlefield, in diplomacy and in confronting the economic blockade will shatter your foundations," Supreme National Security Council Secretary Mohsen Rezaei wrote on X.

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Besides threatening new attacks, Trump on Wednesday also suggested renaming the Strait of Hormuz, the vital oil waterway that Tehran has effectively shut for six months, as "Trump Strait."

"Now that we have it under U.S.A. control, should we change the name Hormuz Strait to TRUMP STRAIT???" the US president said in a post on Truth Social.

He later implied that he wasn't serious. "It was just thrown out there," Trump told an AFP reporter who asked about his post.

Iran targeted US bases in Jordan, the United Arab Emirates, Kuwait, Bahrain, and Iraq's autonomous Kurdistan region after extensive US bombardment on Tuesday of sites across Iran.

Iran reacted with fury after the Iranian Red Crescent said four people including a child were killed and more than 50 people wounded by a US attack that hit a wedding in Iran's south.

"The truth of this unlawful war of choice – and the true face of the war crime – is in Sirik, where a wedding ceremony was brutally bombed as part of America's desperate struggle to conceal its failure," foreign ministry spokesman Esmaeil Baqaei posted on X.

The US military did not address the incident directly.

US Central Command (CENTCOM) spokesman Tim Hawkins said "the US military never targets civilians, unlike the IRGC," referring to Iran's Revolutionary Guards.