More than 90 people are now known to have been killed in a suicide bomb attack at a military parade rehearsal in Yemen's capital, Sanaa, defence ministry officials say.

The attacker, who was reportedly wearing an explosives belt under his army uniform, blew himself up among soldiers at al-Sabin Square.

Yemeni officials say 222 people were injured near the presidential palace - the deadliest attack in the capital since Abdrabbuh Mansour Hadi was elected president in February.

Explosives experts were sent to the scene, amid fears that there could be more bomb blasts.

Most of the casualties were from the Central Security Organisation (CSO), a paramilitary force commanded by Yahya Saleh, a nephew of former President Ali Abdullah Saleh. Yahya Saleh was sacked after the attack.