The explosion comes hours after Libya's UN-supported government says it accepted a ceasefire proposed by the UN aimed at halting combat in the capital, Tripoli, during the upcoming Muslim holiday of Eid al Adha.
The Syrian regime had announced a truce from Friday to halt three months of deadly regime and Russian bombardment on Idlib province that has killed more than 790 civilians.
Libyan strongman Khalifa Haftar, who is leading a military offensive against the UN-recognised government in Tripoli, rejects a ceasefire requested by French President Emmanuel Macron during talks in Paris, an Elysee official says.
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.
The United Nations announced a deal on the two-stage pullback from Hudaida city and its ports in February, but the redeployment failed to materialise on the ground and the peace effort has since stalled.
Houthi rebels say their leader, Abdul Malek al Houthi, met with Griffiths on Sunday to discuss the implementation of peace deals from December talks with Yemen's internationally recognised government.
The pullback from Hudaida was initially agreed in December during talks in Sweden but deadlines for both sides to move their forces away from the ports and parts of the city were missed.
The UN-brokered truce came into effect overnight, there were some skirmishes early on, which have now subsided. Hudaida is a key lifeline for aid to impoverished and war-torn Yemen.
Though the warring factions agreed on several issues in Sweden, Yemenis are still waiting to see if the agreement comes into effect.
The war in Yemen pits the internationally recognised government-in-exile, supported by a Saudi-led coalition, against Iran-linked Houthi rebels. It has made Yemen the world's worst humanitarian crisis. Hudaida is a key port city and aid lifeline.
Hamas and Israel have fought a cross-border battle of rocket attacks and air strikes, triggered by a botched Israeli undercover raid in Gaza on November 11, ending an Egyptian-brokered ceasefire.
In a letter to The New York Times, Turkey's Foreign Minister Mevlut Cavusoglu warned that US-backed YPG terrorists have an alliance with Syrian regime leader Bashar al Assad and are sending forces to help him recapture Idlib.
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