A woman walks past a mural depicting a U.S. aircraft carrier under missile attack in downtown Tehran, Iran, Monday. (AP Photo/Vahid Salemi)

DUBAI, United Arab Emirates (AP) — The U.S. military said Wednesday it began another round of strikes against Iran, threatening to derail efforts to end the war after President Donald Trump warned that Tehran would “pay the price” for stalled negotiations.

U.S. Central Command said in a social media post that the military was striking “multiple targets in Iran,” attacks that were “in response to Iran’s unwarranted and continued aggression.”

The second day of American strikes came hours after Bahrain, Kuwait and Jordan — all of which host U.S. troops — came under Iranian fire. It was the third time this week that back-and-forth strikes have tested a two-month ceasefire. They also came a day after the U.S. struck Iran following the crash of an Army helicopter near the Strait of Hormuz that Trump blamed on the Islamic Republic.

Trump has urged Iran to sign a deal to end the war and suggested earlier this week that an agreement could be reached in a matter of days.

Iranian media reported that explosions were heard in Bandar Abbas, Sirik and Minab in the south of the country.

Iran has proved resilient despite weeks of heavy bombing. It is betting that its ability to effectively close the Strait of Hormuz — a crucial passageway for oil and natural gas — gives it a strong bargaining chip.

Iran’s United Nations envoy said the U.S. should refrain from threats of force if it wants a deal.

“Iran has never negotiated under threats and pressure and will never submit to pressure or question,” Ambassador Amir Saeid Iravani told the U.N. Security Council on Wednesday.

Still, both countries seem to be looking for a way to end the conflict — if they can manage to sell it as a win at home.

Israeli Prime Minister Benjamin Netanyahu appears intent on pursuing goals that make compromise harder: the collapse of Iran’s theocratic government, the elimination of its nuclear program, and the destruction of the Iranian-allied Hezbollah militant group in Lebanon. On Monday, Iran and Israel targeted each other.

Since the U.S. and Israel started the war with Feb. 28 attacks on Iran, the conflict has shaken the global economy, driven up energy prices worldwide, and made food and other basics more expensive.

The international benchmark for crude oil traded above $93 a barrel on Wednesday, up more than 25% since the start of the war.

Trump said Wednesday the U.S. military has since last month undertaken a “secret mission” to sneak oil shipments past Iran’s forces in the Strait of Hormuz. He said ships were slipping through at night, aided by the destruction of Iranian radar equipment.

Trump said as a result more than 100 million barrels of oil have evaded Iran’s chokehold on the strait. There was no immediate confirmation of that figure, which roughly equals five days of oil shipments through the waterway before the war began.

The military’s role was not immediately clear. Capt. Tim Hawkins, a Central Command spokesman, said U.S. forces “communicate and coordinate” with commercial ships in the area, but gave no details on military support being offered.

Earlier Wednesday, the U.S. military said an American aircraft fired “precision munitions” into the engine room of the Palau-flagged vessel M/T Settebello as it attempted to breach the naval blockade with a shipment of Iranian oil. It was the eighth merchant vessel disabled by U.S. forces in waters off Iran.

India’s foreign ministry said three Indian sailors were missing after the Settebello was struck, while 21 others were rescued. Its statement did not mention the U.S. military or the blockade.