US President Donald Trump has threatened to blow up a major gas field in Iran if it attacks the US's Gulf Arab ally Qatar again.

Trump's threat came after a day in which Israel hit Iran's South Pars - part of the world's largest natural gas field. Tehran retaliated by striking an energy complex in Qatar, causing "extensive damage" and leading to a spike in energy prices.

While Israel has not officially confirmed its attack on the gas field, the US president said the US "knew nothing" about its ally, which had "violently lashed out" at Iran "out of anger for what has taken place in the Middle East".

Conflict across the region continues after the US and Israel launched wide-ranging strikes on Iran on 28 February.

Tehran has responded by launching attacks on Israel and US-allied states in the Gulf. Israel is also fighting Iran-backed Hezbollah in Lebanon, where more than a million people have been displaced.