The UN Security Council condemned this week’s ballistic missile attack by Iran-backed Houthi rebels in Yemen against Saudi Arabia’s capital “in the strongest possible terms.”

A statement approved Friday by all 15 council members “also expressed alarm at the stated intention of the Houthis to continue these attacks against Saudi Arabia, as well as to launch additional attacks against other states in the region.”

The Security Council also called for implementation of an arms embargo on the Houthis and called on the parties in Yemen to start negotiating a political settlement.

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The Saudi-led coalition fighting Yemen’s rebels said it intercepted a missile over Riyadh on Tuesday. The Houthis fired the missile targeting the Yamama Palace in Riyadh, where the Saudi monarch presides at weekly government meetings and receives foreign leaders.

It was the second time in as many months that a rebel projectile had reached as far inside the kingdom as Riyadh.

The statement from the US-backed coalition, carried by Saudi state TV, said the missile was fired by the Houthis. State TV said no damage was caused by the intercepted missile.

The coalition later said the missile launch proved the “continued involvement” of Iran in supporting the Houthis. It also repeated its claim that the rebels use “relief work outlets” to smuggle such missiles inside Yemen to target the kingdom.

Residents of Riyadh posted videos on social media Tuesday showing a small cloud of smoke in the sky after hearing a loud explosion.

סעודיה: טיל בליסטי ששיגרו המורדים החות'ים יורט בשמי ריאד • @dannymoljo עם הפרטים >> https://t.co/4cHFmjdbkP pic.twitter.com/xM2DGRcnLR — חדשות עשר (@news10) December 19, 2017

Houthi spokesman Mohammed Abdul-Salam tweeted that a ballistic “Volcano H-2” missile was used in the attack. The rebels’ military media said the missile targeted “an expanded meeting of the Saudi top leadership at Yamama palace in Riyadh.”

In a televised address, rebel leader Abdul-Malik al-Houthi said the range of missiles in the Houthi arsenal was being extended. “Our long hand will reach other places, God willing,” he said.

“As long as you continue to target Sanaa we will strike Riyadh and Abu Dhabi,” he said, referring to the seat of government of the United Arab Emirates, a key member of the coalition. Earlier this month, the Houthis claimed they fired a missile at an under-construction nuclear plant in the Emirates. The UAE denied the claim.

On November 4, the Houthis targeted Saudi Arabia’s international airport in Riyadh, and Saudi Air Defense said it was intercepted. However, a New York Times analysis of photos and videos from the attack suggested air defenses may have missed the projectile and that the warhead struck near its intended target.

Saudi Arabia has the US-made Patriot surface-to-air anti-missile system, which President Donald Trump credited for bringing the November 4 missile down.

In the almost three years that the Saudi-led coalition has waged war with Yemen’s rebels, dozens of other missiles have been fired by the Houthis across the border into Saudi Arabia, reaching as far as some border towns. There have been casualties among local residents in those attacks.

The Saudi-led coalition has been at war with the Houthis since March 2015. The Houthis, who are allied with Saudi Arabia’s rival, Iran, have forced into exile the Saudi-backed and internationally recognized government of President Abed Rabbo Mansour Hadi.

Despite a fierce air campaign against the Houthis, the rebels still control the Yemeni capital, Sana’a, and much of the country’s north along the border with Saudi Arabia.

Earlier this month, the Houthis killed Yemen’s former president, Ali Abdullah Saleh, after he broke off his alliance with them and appeared ready to switch sides.

Yemen’s war has killed more than 10,000 civilians and driven millions to the brink of famine.