The authorities gave no indication of foul play in the blast that killed at least two people, wounded 120 others and damaged several buildings and stores.
Three people killed in main Sanaa city after rebels shoot down a spy drone of Saudi-led military coalition, Houthi officials say.
The International Committee of the Red Cross has facilitated the release and repatriation of nearly 100 Yemeni prisoners.
Yemen's government has blamed Houthi rebels for the postponement of the flight meant to transport passengers in need of medical treatment to Jordan's capital.
During the two-month truce, the Saudi-led coalition will allow 18 vessels carrying fuel into the port of Hodeida, and two commercial flights a week from the Yemeni capital to Jordan.
Iran-backed rebels say they "regretted the absence of a clear and transparent response" from Saudi Arabia to their own ceasefire initiative, a day after the Saudi-led coalition declared Ramadan ceasefire in the poor Arab country.
The Houthi rebels said the peace initiative could be a lasting commitment if the Saudi-led coalition fighting in Yemen stopped air strikes and lifted port restrictions.
Türkiye strongly condemned the 'heinous attack' by members of the Iranian-backed group who damaged the monument dedicated to Ottoman Empire troops.
The terror status will hurt the Houthis from several sides as the group will now struggle to access financial, commercial and arms routes.
Coalition says its target, a telecommunication system in capital Sanaa, was being used by Houthi rebels to "launch hostile operations."
The Israeli president’s recent trip to the UAE served to send a message not only to the Emiratis, but also the wider Arab-Islamic world.
Rebels target northern city with a ballistic missile, killing two government soldiers and three civilians, a local medic says.
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