Since February, Iran-backed Houthi rebels have been pushing to capture the province from the internationally recognised government to try to complete their control over the northern half of Yemen.
If they succeed, the Houthis could claim a strategic win after a largely stalemated battle in almost seven years of fighting.
Among the civilian casualties were 13 people residing in makeshift settlements for displaced families, added the UNHCR.
The escalation in violence has so far displaced over 13,600 Yemenis in Marib, which already hosts a nearly one million of Yemen's internally displaced people, said the statement.
Almost 80 percent of the newly-displaced are women and children who live in extreme poverty, said the UNHCR.
UNHCR is renewing its call on all parties to the conflict to take measures to protect civilians, as well as civilian infrastructure, including sites hosting the displaced, read the statement.
The UNHCR pleaded for urgent support from the international community to alleviate "the desperate situation" of the displaced Yemenis, deploring the decline in funding allocated to humanitarian efforts in the Arab world's poorest country.
Yemen has been convulsed by civil war since 2014 when the Houthis took control of the capital of Sanaa and much of the northern part of the country, forcing the government of President Abed Rabbo Mansour Hadi to flee to the south, then to Saudi Arabia.
The Saudi-led coalition, backed at the time by the U.S., entered the war months later to try restore Hadi to power.
Despite a relentless air campaign and ground fighting, the war has deteriorated into a stalemate, killing about 130,000 people and spawning the world's worst humanitarian crisis.
The Biden administration last month officially withdrew its backing for the coalition but said the U.S. would continue to offer support to Saudi Arabia as it defends itself against Houthi attacks.
The Saudis have recently offered a ceasefire deal, but Houthis turned them down.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
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