A rebel missile attack killed at least 26 members of pro-government forces in a camp Friday east of the Yemeni capital Sanaa, hospital officials in the town of Marib said.
A loyalist military source said the attack, targeted the mosque at Kofel camp in Marib province during Friday weekly prayers.
The attack was carried out with Katyusha-type rockets, said a military official in Marib.
Shia Houthi rebel-controlled news agency Saba said rebels had carried out the attack.
It said the main weapon used was Zelzal-1 Iranian-made missiles and it was followed by artillery fire.
"Dozens of bodies of burned soldiers were evacuated from the site," it said, without mentioning that a mosque had been hit.
Pro-government forces have retaken large parts of Marib province from Iran-backed Shia Houthi rebels since the March 2015 launch of a Saudi-led intervention in favour of President Abedrabbo Mansour Hadi.