Iran lashed out at the oil-rich Gulf Thursday after Israel targeted its largest offshore gas field, sending shockwaves through global energy markets.

Tehran struck the world’s largest liquefied natural gas facility in Qatar and threatened further attacks on regional energy infrastructure, while Donald Trump warned of a forceful U.S. response if the strikes continue.

International benchmark Brent surged 10% before falling back, while European gas rose 35% after Iran attacked Qatar's huge Ras Laffan LNG facility in retaliation for an Israeli strike on its South Pars gas field.

Trump, whose country started the war alongside Israel with their attack on Iran on Feb. 28, said Washington did not know about the strike on South Pars.

But he warned the United States would itself "blow up" the Iranian gas field if Tehran did not stop attacking Qatar.