"A suicide bomber dressed as a woman killed 33 people in central Yemen when he blew himself up at a celebration by Shiite militia supporters, medical and security sources say.
Dozens of people were also wounded in the attack in the mainly Sunni city of Ibb, held by the Huthi Shiite militia, the medics said, warning that the death toll was likely to rise.
Yemen has been dogged by instability since an uprising forced longtime strongman Ali Abdullah Saleh from power in 2012, with Huthi rebels and Al Qaeda seeking to fill the power vacuum.
Among those wounded in Wednesday's attack was Ibb governor Yahya al-Aryani, who was attending the Huthi commemoration of the Prophet Mohammed's birthday, a medic said.
A security source told AFP the bomber had been wearing a woman's black abaya and veil when he detonated his suicide belt."