Iran's Supreme Leader, Ayatollah Ali Khamenei, has been killed in a joint American and Israeli strike, according to US president Donald Trump.

"Khamenei, one of the most evil people in History, is dead," Trump wrote on his Truth Social platform.

Satellite images showed damage to Khamenei's compound in Tehran earlier on Saturday following the raids, and the Israeli prime minister later said there were growing signs Khamenei was "gone". Iran has not confirmed his death.

Dozens of people were reportedly killed across the country. In response, Iran launched attacks throughout the Middle East, with strikes reported in a number of countries with US bases or allied to the US.

Writing on Truth Social, Trump said: "This is not only justice for the people of Iran, but for all Great Americans."