Israel's Prime Minister Benjamin Netanyahu has said Israel "acted alone" in attacking an Iranian gas field, as tensions mount over strikes on energy infrastructure across the region.

Israel hit Iran's South Pars - part of the world's largest natural gas field - and Tehran retaliated by striking an energy complex in Qatar and attacking other energy targets in the Gulf.

The attacks led to a spike in energy prices and US President Donald Trump later posted he had not known about them in advance.

The fallout has raised questions over how united Israel and the US remain in their war aims.

Speaking at a news conference on Thursday, the Israeli leader said Trump had requested that there be no further such attacks on energy targets.