Yemeni officials says two ballistic missiles were used in the attack targeting a mosque and a religious school in the oil-rich Marib province.

Fighting between government forces and Houthis has escalated in recent months.
Fighting between government forces and Houthis has escalated in recent months. (AFP)

At least 29 civilians, including women and children have been killed and injured in a Houthi ballistic missile attack on a mosque and a religious school in the Yemeni province of Marib.

Two ballistic missiles were used in the attack late on Sunday, Marib governor's office said in a statement.

There was no immediate claim of responsibility by the Iranian-backed Houthis.

READ MORE: Houthi missile attack kills over a dozen people in Yemen's Marib

The United Nations says some 10,000 people were displaced in September by fighting in Marib, the internationally recognised government's last northern stronghold. It is calling for a humanitarian corridor for aid.

The war in Yemen and ensuring economic collapse as well as restrictions on imports to Houthi-held areas have caused what the United Nations says is the world's biggest humanitarian crisis, with 16 million people facing starvation.

READ MORE: UN: Millions of Yemenis are 'marching towards starvation'

A coalition of forces led by Riyadh intervened in Yemen in March 2015 after the Iran-aligned Houthis ousted the Saudi-backed government from the capital Sanaa in late 2014. 

The Houthis say they are fighting a corrupt system and foreign aggression.

The Houthi movement seized new territory in the energy-rich provinces of Shabwa and Marib in October, gains confirmed by sources, as it presses an offensive likely to further complicate international peace efforts.

Source: TRTWorld and agencies