The Daesh group claimed an attack on two Huthi rebel leaders in Sanaa on Monday night that medics said had killed at least 28 people, including eight women.
The car bomb attack targeted Huthi rebel chief brothers Faycal and Hamid Jayache during a gathering to mourn the death of a family member, a security source said.
Huthi rebels closed down the surrounding area in the centre of the city after the attack, only allowing through emergency services to help evacuate the victims, witnesses said.
In a statement posted online, the Daesh group said it had organised the attack on what it called a “Shiite nest” in the Yemeni capital.
The extremist Sunni jihadist group considers Shiites as heretics and has frequently targeted them in attacks in several countries.
The last of these, a suicide bombing by a Saudi national on Friday in a Shiite mosque in Kuwait, killed 26 people and wounded 227 others.
Daesh has also claimed a car bombing on June 20 against a Shiite mosque in Sanaa that killed two and wounded 16 and another series of attacks in the Yemeni capital four days earlier that killed 31.
The jihadist group, which marked the first anniversary of the declaration of its “caliphate” in Iraq and Syria on Monday, has been ramping up deadly attacks in Yemen since March.
Iran-backed Huthi rebels have seized vast swathes of Yemen since launching an offensive in July 2014, forcing President Abedrabbo Mansour Hadi to flee the country.
Neither peace talks in Geneva or a Saudi-led air campaign begun in March have driven them from power and they remain locked in battle with pro-government fighters, Sunni tribesmen and southern separatists.