Conflicting accounts of the killing of General Abdulaziz al-Faghem and an irregular confirmation of his death by official sources have led to a rise in speculation that foul play was involved, or at worst a coup within the House of Saud.
Earlier, the rebels announced they would release 350 prisoners, including three Saudi Arabians, under UN's supervision as part of peace initiative.
The education of a further 3.7 million children at risk as teachers' salaries have not been paid in more than two years, UNICEF warns in a statement.
The statement from UN envoy for Yemen came after Houthi rebels announced a halt in all attacks against the territory of Saudi Arabia, hoping “the gesture would be answered by a stronger gesture" from the Saudis.
While the Saudi kingdom has developed a compact fighting mechanism aided by superior air support, Tehran has gained significant battleground experience in the last few decades, accompanied by long-range ballistic capability.
UN war crimes investigators said an independent panel sent a secret list to UN human rights chief Michelle Bachelet identifying "individuals who may be responsible for international crimes" in the country.
The drone attack targeted Abha regional airport, which has repeatedly been hit by the Yemeni rebel group in recent weeks.
Saudi special forces in cooperation with their Yemeni counterparts "conducted a successful operation that resulted in the capture of the leader of the Daesh branch in Yemen," says coalition spokesman Turki al Maliki.
The move follows after negotiations between the World Food Program and Iran-backed Houthi rebels stalled on an agreement to introduce controls to prevent the diversion of food away from the needy.
Up to 60 percent of beneficiaries at seven centres in Sanaa "confirmed they had not received any assistance" and 33 percent of respondents in the rebels' northern stronghold of Saada received no food in April, says head of the UN food agency.
As part of the "phase one" of a ceasefire, the Houthi movement's unilateral withdrawal from the key ports began on Saturday, in the most significant advance yet for efforts to end the four-year-old war and relieve hunger.
Fresh fighting comes days after Yemeni government accused Houthi rebels of breaching ceasefire and refusing to withdraw from port city in line with December agreement.
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