President Trump said Israel was responsible for the attack, but vowed to “massively” destroy the gas field if Tehran hit Qatar’s energy facilities in retaliation.
Residents in Tehran and elsewhere say the attacks come at all hours and rock the ground.
The South Pars gas field, hit by airstrikes on Wednesday, is central to the energy supply of Iran, which was already suffering blackouts before the war.
The strikes appeared to be some of the most significant attacks on energy sites since the U.S.-Israeli air war against Iran began almost three weeks ago.
The field is part of a vast gas reservoir shared by Iran and Qatar. The strike appeared to be one of the most significant attacks on an energy site since the U.S.-Israeli air war against Iran began.
A U.S. attack or a move to seize control of Iran’s main oil export hub could cripple the country’s ability to profit from its natural resources. But it would also risk sending energy prices even higher.
Airline executives said the war in Iran had raised fuel costs and, as a result, fares, but that had not yet hurt demand for tickets from individuals and businesses.
The ship was struck near an Emirati port, in the first such attack in five days. The United Arab Emirates also said it was intercepting Iranian drones and missiles.
Iranian-linked ships carrying Russian oil were among those that received temporary exemptions from sanctions, a sign of how dire the energy crisis is becoming.
President Trump said he might postpone a trip to China to focus on the war. More than a million people have been displaced in Lebanon this month, according to the country’s health ministry.