A bomb exploded on Friday in a qat market in Yemen's loyalist-held city of Marib, killing three civilians and three soldiers and wounding several others, a local official said.
Qat is a mild narcotic and mainstay of Yemeni social life whose consumption is banned in parts of the country held by the jihadist Al-Qaeda in the Arabian Peninsula (AQAP).
The official said the bomb was planted at the entrance of the market by unknown individuals who apparently wanted to target loyalist forces.
Marib is east of the capital Sanaa which is in the hands of Shia Houthi rebels.
The rebels said on their website sabanews.net that three bombs exploded at the qat market, killing seven people and wounding 15.
They blamed the blasts on "the chaos in the city which is controlled by militiamen and mercenaries" -- a reference to loyalist forces.
The latest violence comes as talks aimed at ending a 13-month devastating war in Yemen are under way in Kuwait between government and rebel delegations.