The tanker was in international waters west of Al Hudaydah, according to a statement by the Saudi coalition spokesman, Col. Turki al-Malki. He did not disclose the extent of the damage but called the assault “a serious threat to the maritime navigation and international trade” in the region.
The spokesman also said a Saudi-coalition warship had escorted the tanker from the area, but he hinted that the stricken vessel might be leaking fuel, saying the attack created the risk of “environmental and economical damage.”
The Houthis control nearly 200 miles of Yemen’s Red Sea coastline, which includes Al Hudaydah, a critical entry point for humanitarian aid. The Saudis have severely limited shipping traffic to the port during the conflict.
There were fears that the missile strike on Tuesday could lead to a tighter Saudi clampdown on Al Hudaydah’s port.
The escalation came against the backdrop of an intense fund-raising effort by the United Nations to help civilians in Yemen, which the organization has called the world’s worst man-made humanitarian disaster.
More than 22 million of Yemen’s 27 million people need emergency aid, nearly 18 million have little or no food, more than one million have been sickened by cholera and more than two million have been displaced from their homes, the United Nations refugee agency said Tuesday on Twitter.
Secretary General António Guterres of the United Nations, who attended a donor conference for Yemen relief in Geneva on Tuesday, said that more than $2 billion had been raised — about half from Saudi Arabia.
Asked at a news conference if he saw a contradiction in aid money donated by a country “to repair what it is destroying,” Mr. Guterres sought to answer diplomatically.
“Well, we all know that there is a war, we all know who are the parties to the war, but the two things need to be seen separately,” he told reporters.
Mr. Guterres also said his special envoy for the Yemen conflict, Martin Griffiths, who recently visited Saudi Arabia and Yemen, had come away “very encouraged” and was now visiting other countries in the region in hopes of establishing a dialogue for talks. “I am optimistic about that possibility,” he said.