SANAA - Arab coalition warplanes bombed rebel camps in Yemen Friday in a second straight day of strikes led by Saudi Arabia, which accused Iran of “aggression” across the region.

Saudi Arabia has vowed to do “whatever it takes” to prevent the fall of its ally President Abedrabbo Mansour Hadi, accusing Iran of backing the Huthi rebels’ power grab. At least 39 civilians have been killed in the Saudi-led Operation Decisive Storm against the Huthis, officials at the rebel-controlled health ministry in the capital said. Twelve died when surrounding residential areas were hit in a raid on a military base north of the city, the officials told AFP.

Three dawn strikes Friday hit the presidential compound in south Sanaa which the rebels seized last month, witnesses said. Warplanes also bombed a Huthi-controlled army brigade in Amran province north of Sanaa, and arms depots in the northern rebel stronghold of Saada, residents said. Hadi, backed by the West and Gulf Arab states, arrived in Riyadh Thursday with officials saying he was on his way to Egypt to join a two-day Arab League summit at the weekend.

It was the first confirmation of Hadi’s whereabouts since the rebels began advancing this week on the main southern city of Aden, where he had taken refuge since fleeing Sanaa last month.

Saudi Arabia says more than 10 countries, including four other Gulf monarchies, have joined the anti-Huthi coalition. As explosions rocked Sanaa, those families who have not already fled huddled in fear. “Whenever a plane flies over our home and is met by anti-aircraft gunfire, my three children run to a corner and start screaming and crying,” said Mohammed al-Jabahi, 32. “We spent a night of non-stop terror and hysteria.” An anti-aircraft missile wounded eight people, one seriously, when it exploded in a market in Sanaa on Friday, a day after being fired by Huthis, a security official said.

The Saudi-owned Al-Arabiya television said the kingdom had deployed 100 warplanes to the operation, while the United Arab Emirates had committed 30, Kuwait 15 and Qatar 10. Bahrain said it had committed 12 fighters. Saudi Arabia has reportedly also mobilised 150,000 troops near the border. The rebels have also clashed with tribes as they push south.

At least 21 Huthis were killed Friday when residents of a tribal southern region ambushed their vehicles north of Aden, a local official said.

The White House voiced concern about “reports of Iranian flow of arms into Yemen”, while Riyadh denounced Tehran.

“The Iranians are the ones who are meddling in the affairs of the Arab countries whether it’s in Lebanon, in Syria, in Iraq... in Yemen,” the kingdom’s ambassador to the United States, Adel al-Jubeir, told Fox News.

“We have to deal with Iran’s aggression in the region. We’re dealing with their support of the Huthis and the Huthis’ attempt to take over in Yemen,” he added.

Iran reacted furiously to the Saudi-led strikes, calling them a violation of Yemen’s national sovereignty.

“Any military action against an independent country is wrong and will only result in a deepening crisis and more deaths among innocents,” Foreign Minister Mohammad Javad Zarif said. Former Yemeni president Ali Abdullah Saleh, who resigned in 2012 following a year of nationwide protests, is accused of allying with the rebels, relying on the loyalty of many army units that he built during his three-decade rule.

The conflict has raised a major hurdle to Washington’s longstanding drone war against Al-Qaeda militants who have exploited the power vacuum since Saleh’s downfall. The Islamic State (IS) group, which has seized vast tracts of territory in Syria and Iraq, is also vying for prominence with Yemen-based Al-Qaeda in the Arabian Peninsula (AQAP). IS recently claimed its first attack in Yemen - suicide bombings which killed at least 142 people at mosques in Sanaa.

Some observers warned that the Saudi strikes risked feeding instability and extremism. “I think the net effect of this operation is ultimately dangerous for Yemen’s future path,” said Frederic Wehrey, a Gulf specialist at the US-based Carnegie Endowment for International Peace.

“It will open up more fissures on the ground, perhaps bolster the Huthis’ popular support as defenders of Yemeni sovereignty, and create more opportunities for AQAP and IS to flourish.”

The fighting triggered a sharp rise on world oil markets on fears the conflict could threaten supplies, although prices gave back some of their gains on Friday. Washington has pledged logistical and intelligence support for the campaign, while Egypt, Jordan, Morocco and Sudan said they were joining it.

Meanwhile, Iran’s foreign minister accused Turkish President Tayyip Erdogan on Friday of fomenting strife in the Middle East, rebuffing his accusation that Iran was trying to dominate the region.

“It would be better if those who have created irreparable damages with their strategic mistakes and lofty politics would adopt responsible policies,” Mohammad Javad Zarif was quoted as saying by the semi-official Fars news agency.

“Under the current circumstances, all countries must work toward establishing stability and preventing the spread of insecurity in the region,” Zarif, who is attending negotiations on Iran’s disputed nuclear programme in Switzerland, added.

Erdogan declared his support on Thursday for a Saudi-led military operation in Yemen targeting the Houthis, and suggested the group’s links to Tehran were evidence of Iranian ambitions.

“Iran is trying to dominate the region... This has begun annoying us, Saudi Arabia and the Gulf countries. This is really not tolerable and Iran has to see this,” Erdogan said at a press conference.