A blast struck a military graduation parade in Yemen's southern town of al-Dhalea, Yemen's Security Belt forces said in a tweet on Sunday, in an attack witnesses said caused dozens of injuries or deaths.
At least five people died and eight were injured, according to local health authority figures quoted by the Security Belt group and in a statement from the local media office of the forces which control al-Dhalea.
A missile blast struck the military graduation parade area just after the ceremony involving Security Belt forces had finished, the statements said.
Witnesses told Reuters that a blast occurred near a guest platform.
The Security Belt forces said three members of the Iran-back Houthi militias were arrested near the blast site.
The blast was caused by a Houthi missile, said the media office.
No one claimed responsibility for the attack.
The town of al-Dhalea lies on the main south-to-north road linking the interim capital Aden to the capital Sanaa that is controlled by the Houthis.