Donald Trump has flagged the US could hit Iran "hard" with fresh strikes in coming hours after declaring the ceasefire between the two countries is "over."However, the US president's rhetoric shifted throughout the day as he talked up a forceful response to claimed Iranian breaches of the truce."It may be a big attack and it'll knock out a lot of stuff," he said sitting next to Ukrainian President Volodymyr Zelenskyy on the sidelines of the NATO summit in Turkiye."I give them a little warning. We're going to hit them hard tonight."Mr Trump said the US was not attacking at the "highest level," saying bridges, power plants and desalination facilities would be in the US military's sights "if we have to"He also suggested Kharg Island, a vital oil facility in the Strait of Hormuz, would be a target as well.Vessels identified by US Central Command as Islamic Revolutionary Guard Corps boats before they were struck in a new wave of US military strikes. (Reuters: Supplied/US Central Command)But Mr Trump rejected suggestions further strikes would constitute a return to all-out war."I don't think [the war is] going to start again," he said."I think it is going to go very quickly."They hit a couple of ships and so we hit them much harder. When they hit, we hit 10 times harder."Iran's Press TV had been citing a security source that each new US attack would be met with two Iranian attacks in response and that the regime in Tehran would close the Strait of Hormuz once more.Trump: I don't want to deal with them any more Earlier in the day, Mr Trump was furious over the latest attacks on ships in the strait, which the US responded to with strikes at Iranian vessels in the Persian Gulf.Explosions were also reported in Iranian port cities, including Bandar Abbas.Iran launched retaliatory missile and drone attacks at countries including Kuwait and Bahrain."I think [the ceasefire deal] is over. I don't want to deal with them any more, they're scum," Mr Trump said."They're sick people. They're led by sick people and they're vicious, violent people."Mr Trump was later asked why he had described the Iranian leadership in such a way, after weeks earlier suggesting they were reasonable."I got to know them," he said.He had said American negotiators would continue talking to Iran, in a bid to reach a lasting peace deal, despite these latest developments.That is despite Iran repeatedly insisting that it would not progress negotiations on the future of its nuclear ambitions, or ongoing control of the Strait of Hormuz, until the interim deal was fully implemented.Key to that is the first point of the agreement, which demands an end to fighting on all fronts, including in Lebanon.Perhaps linked to that situation, or perhaps a throwaway comment, Mr Trump said he believed Israel would "want" to withdraw its forces from southern Lebanon.Israel has shown little interest or urgency in doing that, as it maintains Iranian-backed Lebanese militant group Hezbollah remains a threat.Israel has not publicly commented on the developments with Iran, watching to see how the situation develops.Trump says Iran wanted time to mourn Mr Trump said Iran's leadership had requested time to observe the funeral of slain supreme leader Ali Khamanei, who was killed in an airstrike on the very first day of the war.His coffin was paraded through the streets of the Iraqi city of Najaf, one of the holiest sites for Shia Muslims, as part of the weeklong mourning ceremony.Time to mourn was requested by Iran, grieving their late supreme leader in a multi day funeral this week. (Reuters)Coinciding with the funeral, Iranian authorities released the first images of Khamanei's former compound.The vision showed the level of destruction at the former Tehran residence, where the supreme leader and other members of his family were killed on February 28.It is believed that strike also left his son and successor, Mojtaba Khamanei severely injured.He has not been seen publicly since the strike, despite being picked as the country's new leader.