The Saudi-led coalition killed 14 people in air strikes on Yemen’s rebel-held capital, a medical source said on January 18, after an attack by Huthi insurgents on the UAE sent regional tensions soaring.

Sanaa residents were combing the rubble for survivors of the strikes that levelled two houses, hours after the Huthis had killed three people on January 17 in a drone and missile attack on the UAE capital Abu Dhabi.

Huthi Brigadier General Abdullah Qassem al-Junaid, director of the rebels’ air force academy, was killed along with family members, the rebels’ Saba news agency said.

Coalition forces launched further strikes on Sanaa on January 18.

“The search is still going on for survivors in the rubble,” said Akram al-Ahdal, a relative of several of the victims.

The UAE, part of the Saudi-led coalition fighting the Iran-backed rebels, had vowed a tough response to January 17’s attack, the first deadly assault acknowledged inside its borders and claimed by the Yemeni insurgents.

The attack on the renowned Middle East safe haven of the UAE opened a new front in the seven-year war and followed a surge in fighting in Yemen, including battles between the rebels and UAE-trained troops.

Crude prices soared to seven-year highs partly because of the Abu Dhabi attacks, which exploded fuel tanks near storage facilities of oil giant ADNOC. The Huthis later warned UAE residents to avoid “vital installations”.

Yemen occupies a strategic position on the Red Sea, a vital conduit for oil from the resource-rich Gulf.

After the attacks, Saudi Arabia’s de facto ruler, Crown Prince Mohammed bin Salman, and Abu Dhabi Crown Prince Mohammed bin Zayed agreed to “jointly stand up to these acts of aggression”, UAE state media said.

But the deadly Saudi counter-strikes against the Huthis received harsh criticism from UN Secretary-General Antonio Guterres, who said he “deplores” the “numerous civilian casualties,” his spokesperson Stephane Dujarric said.

Guterres “again calls upon all parties to exercise maximum restraint and prevent further escalation and intensification of the conflict,” Dujarric added.

The UAE has demanded an emergency meeting of the UN Security Council.

“This illegal and alarming escalation is a further step in the Huthis’ efforts to spread terrorism and chaos in our region,” the UAE’s ambassador to the UN, Lana Nusseibeh, said in a letter to the Security Council’s president.

The Abu Dhabi attack marked a new phase in the Yemen war and further reduced hopes of any resolution to the conflict, which has displaced millions in what was already the Arabian peninsula’s poorest country.

The US pledged to hold the Huthis accountable, while Britain, France and the European Union also condemned the assault.

The targeting of Abu Dhabi followed intense clashes in Yemen, including advances by the UAE-trained Giants Brigade, who drove the rebels out of Shabwa province.

The defeat dealt a blow to the Huthis’ months-long campaign to capture neighbouring Marib, the government’s last stronghold in the north.