Clashes in Yemen's Marib kill around 50 fighters: govt source
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Earlier this month, the Huthis resumed a push to capture Marib city, 120 kilometres (75 miles) east of the rebel-held capital Sanaa.
The city lies close to some of Yemen's richest oil fields and its capture would be major prize for the rebels.
A Saudi-led coalition launched more than 12 air strikes in support of government forces on the ground, according to rebel channel Al Massirah.
Since then, clashes have resulted in hundreds of deaths among fighters on both sides, according to government sources, and displaced hundreds of families. The Huthis generally do not disclose their losses.
Yemen has been embroiled in a bloody power struggle since 2014 between its government, supported by the Saudi-led military coalition, and Huthi rebels, who control most of the north.
The grinding conflict has claimed tens of thousands of lives and displaced millions, according to international organisations, sparking what the UN calls the world's worst humanitarian crisis.