At least 60 people have been killed in a suicide car bombing at a military facility in the southern Yemen city of Aden, doctors say.
A training camp, or compound used by the pro-government Popular Resistance militia, was hit, reports say.
So-called Islamic State said it carried out the attack.
It comes amid a fresh push to end Yemen’s 17-month-old war between Saudi-backed government and rebels that the UN says has left 6,600 people dead.
Some 2.5 million Yemenis have also been displaced.
IS’s self-styled news agency Amaq said the group had carried out Monday’s attack.