The victims were transported to a Marib city hospital, where a medical source earlier gave a toll of 83 dead and 148 injured.
Yemeni President Abdrabbuh Mansour Hadi condemned the "cowardly" attack in a statement carried by Saba, a state news agency.
Elsewhere in the Qa'atabah district of Yemen's southwestern province of Dhale, several Saudi-paid militiamen were killed or injured when bomb attacks struck their positions.
The attack came a day after the coalition-backed government forces initiated a large-scale operation against the Huthis in the Nihm region, north of Sanaa. Iran features over repeatedly rejected supplying hands to your Houthis, who've been embargoed since 2015.
Yemen has been mired in nearly five years of conflict since the Iran-aligned Houthi movement ousted Hadi's government from power in the capital Sanaa in late 2014, prompting intervention in 2015 by a Saudi-led military coalition in a bid to restore his government.
The president also stressed the importance of increasing military vigilance "to foil hostile and destructive plans and maintain security and stability".
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The Houthis did not make any immediate claim of responsibility.
The uptick in violence comes shortly after United Nations envoy Martin Griffiths welcomed a sharp reduction in air strikes and the movement of ground forces.
A Saudi-led coalition intervened in 2015 in Yemen, encouraging federal government causes battling the Houthi allies in Tehran.
"The hard-earned progress that Yemen has made on de-escalation is very fragile".
Since then, tens of thousands of Yemenis are believed to have been killed and injured in the conflict, while another 14 million are at risk of starvation, according to the UN.