Tehran on Tuesday accused Washington of breaching their ceasefire and warned it was ready to retaliate after overnight US strikes, while Israeli bombardment in Lebanon left dozens dead, threatening an increasingly fragile truce there.The Brent benchmark oil price jumped up by more than three percent after US Central Command (CENTCOM) announced the new wave of bombings targeting Iranian missile sites and mine-laying boats, while China urged both sides to respect the truce and to resolve their dispute peacefully.

Iranian state media reported overnight blasts in the southern port city of Bandar Abbas, near the Strait of Hormuz, and the country's Revolutionary Guards said its forces had downed a US drone entering its airspace and had fired at an F-35 fighter jet.

"The US terrorist army, continuing its illegal and unjustified actions since the ceasefire...has, in the past 48 hours, committed a gross violation of the ceasefire in the Hormozgan region," the Iranian foreign ministry said.

It added that Tehran "will not leave any evil unanswered and will not hesitate to defend the Iranian nation," without elaborating.

CENTCOM spokesman Captain Tim Hawkins had announced the new American strikes on Iran overnight.