The coalition, which backs Yemen's internationally recognised government, has reported near-daily strikes over the past month against the Iran-backed Houthis, each time claiming high losses.

"Fourteen military vehicles were destroyed and more than 157 terrorist elements eliminated" in the latest raids, the coalition said in a statement carried by the Saudi state news agency SPA.

The air strikes targeted two regions of oil-rich Marib province, Al-Jawf in the north and the south's Al-Bayda, it said, as well as Sirwah, west of Marib city.

The Houthis began a major push to seize the city in February and, after a lull, they renewed their offensive in September.

Marib is the embattled government's last stronghold in the north. A loyalist military official acknowledged Tuesday that the Houthis have made advances on the ground.

Yemen's civil war began in 2014 when the Houthis seized the capital Sanaa, prompting Saudi-led forces to intervene to prop up the government the following year.

Tens of thousands of people have died and millions displaced in what the United Nations calls the world's worst humanitarian crisis.