SANAA, Yemen (AP) — The turmoil in Yemen grew into a regional conflict Thursday, with Saudi Arabia and its allies bombing Shiite rebels allied with Iran, while Egyptian officials said a ground assault will follow the airstrikes.
Iran denounced the Saudi-led air campaign, saying it "considers this action a dangerous step," and oil prices jumped in New York and London after the offensive.
The military action turned impoverished and chaotic Yemen into a new front in the rivalry between Saudi Arabia and Iran.
Yemen's U.S.-backed President Abed-Rabbo Mansour Hadi, who fled the country Wednesday as the rebels known as Houthis advanced on his stronghold in the southern port of Aden, reappeared Thursday. He arrived by plane in Saudi Arabia's capital of Riyadh, Saudi state TV reported.
Starting before dawn, Saudi warplanes pounded an air base, military bases and anti-aircraft positions in the capital of Sanaa and flattened a number of homes near the airport, killing at least 18 civilians, including six children. Another round followed in the evening, again rocking the city.
Rebel leader Abdul-Malik al-Houthi angrily accused the United States, Saudi Arabia and Israel of launching a "criminal, unjust, brutal and sinful" campaign aimed at invading and occupying Yemen.
"Yemenis won't accept such humiliation," he said in a televised speech Thursday night, calling the Saudis "stupid" and "evil."
The Houthis, who have taken over much of the country, mobilized thousands of supporters to protest the airstrikes, with one speaker lashing out at the Saudi-led coalition and warning that Yemen "will be the tomb" of the aggressors.
Saudi Arabia's ambassador to the U.S. Adel al-Jubeir said at a news conference in Washington on Thursday that Iran has been a major backer of the Houthis, with Revolutionary Guard officers and operatives from the Iran-backed Lebanese militia Hezbollah on the ground advising the rebels.
White House spokesman Eric Schultz told reporters on Air Force One en route to Alabama that President Barack Obama had authorized logistical and intelligence support for the strikes, but that the U.S. is not joining with direct military action.
In the air assault codenamed "Operation Decisive Storm," Saudi Arabia deployed some 100 fighter jets, 150,000 soldiers and other navy units, Saudi-owned Al-Arabiya TV reported. Also involved were aircraft from the United Arab Emirates, Bahrain, Qatar, Kuwait, Jordan, Morocco, Sudan and Egypt, though it was not clear which carried out actual strikes.
Once the airstrikes have weakened the rebels and their allies in the military forces loyal to former President Ali Abdullah Saleh, a ground invasion of Yemen is planned by Egyptian Saudi and other forces.
The assault will come from Saudi Arabia and by landings on Yemen's coasts along the Red and Arabian seas, according to three Egyptian military and security officials.
Three to five Egyptian troop carriers are stationed offshore, they said, although the number of troops was not specified, and the timing of the operation was not given.
The aim is not to occupy Yemen but to weaken the Houthis and their allies until they enter negotiations for power-sharing, the officials said, speaking on condition of anonymity because they were not authorized to talk about the plans with the press.
Egypt is "prepared for participation with naval, air and ground forces if necessary," Foreign Minister Sameh Shukri said at a gathering of Arab foreign ministers preparing for a weekend summit in the Egyptian resort of Sharm el-Sheikh.
Saudi Arabia and fellow Sunni-led allies in the Gulf and the Middle East view the Houthi takeover as an attempt by Iran to establish a proxy on the kingdom's southern border. Iran and the Houthis deny that Tehran arms the rebel movement, though it says it provides diplomatic and humanitarian support.
The Saudis and their Gulf allies on Thursday asked members of the United Nations Security Council for a resolution that would impose an arms embargo on the rebels and impose financial sanctions on individual members.
The dramatic escalation of the conflict underscores the political complexities for Washington in the Middle East:
— A traditional ally of Saudi Arabia, the U.S. is trying to negotiate a nuclear deal with Iran by the end of the month.
— In Iraq, the U.S. and Iran are implicitly on the same side — helping the Shiite-led Baghdad government battle the Sunni extremists of the Islamic State group, although Tehran and Washington are avoiding any actual contact.
— In Yemen, the U.S. is backing Gulf Arab states against the Shiite rebels allied to Iran. At the same time, the al-Qaida branch in the country — the target of a U.S. drone campaign — is also fighting the Shiite rebels.
Iran condemned the airstrikes that left "innocent Yemenis wounded and dead, and considers this action a dangerous step," said Foreign Ministry spokeswoman Marzieh Afkham. "This invasion will bear no result but expansion of terrorism and extremism throughout the whole region."
Yemen plays a crucial geographic role in the world's oil supply, with tankers that go through the Suez Canal having to navigate around the country. The turmoil caused the price of benchmark U.S. crude to jump $2.22, closing at $51.43 a barrel on the New York Mercantile Exchange. Brent crude, a benchmark for international oils, rose $2.71 to $59.19 a barrel in London.
Saudi Arabia, Kuwait, Emirates, Qatar and Bahrain said their action aimed to "protect" Yemenis from Houthis who are "a tool in the hands of foreign powers."
In recent months, the Houthis have swept out of their northern strongholds to take over Sanaa and much of the north.
The Houthis have succeeded in their advance with help from Saleh, the autocrat who ruled Yemen for more than 30 years until he was ousted after a 2011 Arab Spring popular uprising. He remained in the country, enjoying the loyalty of some of the strongest military units, which undermined Hadi. Those units are now fighting alongside the Houthis.
The airstrikes appeared to give new spirit to military units and militiamen loyal to Hadi. In Aden, pro-Hadi militiamen battled in two districts with Houthi fighters backed by Saleh's forces. Bodies of slain fighters were seen in the streets, as shops closed and residents sheltered in their houses, witnesses said.
Houthis lashed out in Sanaa as their fighters stormed the offices of at least three TV stations and an independent newspaper they consider close to their opponents. Among them was the Qatari-owned Al-Jazeera TV station, which reported that militiamen stormed its office, broke surveillance cameras and damaged equipment.
Hadi had hoped to cling to power with the backing of some police and military units and allied militiamen. But as the Houthis and their allies bore down on Aden, Hadi fled, according to security officials.
A Yemeni security official said Hadi had gone by boat Wednesday to the Yemeni port of al-Mukalla in the western province of Hadramawt, where he spent the night. He drove over the border into Oman the next day and was flown to Riyadh. The official spoke on condition of anonymity because he was not authorized to release the information.
Hadi is expected to attend an Arab summit in the Egyptian resort of Sharm el-Sheikh on Saturday. Foreign ministers preparing for the meeting agreed on a draft program to create a new joint Arab defense force to intervene in regional crises, including possibly Yemen. The Egyptian security and military officials said the force is planned to include some 40,000 men backed by jet fighters, warships and light armor.
Hendawi reported from Sharm el-Sheikh, Egypt. Sarah el Deeb and Maggie Michael contributed to this report from Cairo, Egypt.