World Bulletin / News Desk
Houthi rebels fired a mortar shell on a crowded street in the city, a police officer said.
Yemen’s official Saba news agency said the shell struck a marketplace in the city.
The source said the death toll was expected to rise as many of the injured were in a serious condition.
Houthis hold a mountainous area in Sirwah district near Maarib, from where they launch attacks on civilian and military targets in the city.
Impoverished Yemen has been wracked by conflict since 2014, when the Shia Houthi group overran much of the country, including capital Sanaa.
The conflict escalated in 2015 when Saudi Arabia and its Sunni-Arab allies launched a wide-ranging military campaign aimed at rolling back Houthi gains in Yemen.
Riyadh has repeatedly accused the Houthis of acting as a proxy military force for Shia Iran, Saudi Arabia’s arch-foe in the region.