Warplanes from the Saudi-led coalition fighting in support of President Abedrabbo Mansour Hadi also bombed suspected Huthi rebel missile launchers east of the capital Sanaa late yesterday, a military official said.
The air raids came after Patriot missiles shot down two rebel missiles on Thursday over Marib, east of the rebel-held capital.
UN special envoy Ismail Ould Cheikh Ahmed said yesterday the ceasefire was "fragile but largely holding", urging all parties "to show restraint, avoid further escalation, and strictly adhere to the 72-hour ceasefire".
The UN envoy is liaising with the parties in an attempt to extend the ceasefire in order "to create a conducive environment for a long-lasting peace" in Yemen, he said in a statement.
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He met with Yemen's Vice President Ali Mohsen al-Ahmar in Riyadh late yesterday, Yemeni state media reported.
Ahmar said government forces were "exercising restraint" and stressed that there were orders to "abide by the truce and respect UN efforts".
Rebel-controlled media, meanwhile, accused the coalition of conducting air strikes across the country, including in the provinces of Sanaa, Saada and Jawf in the north, and Shabwa in the south.
A senior rebel, Hassan al-Sharafi, was killed in border clashes yesterday night in Saada province, the fiefdom of the Iran-backed Huthis, military officials said.
The rebels seized two hills in the Alb border area from government forces who had previously advanced from Saudi Arabia, a military official said.
Nine other rebels and four government soldiers were killed in clashes today on the western outskirts of Midi, a northwestern town close to the Saudi border and the Red Sea coast, military officials said.
It is the sixth ceasefire attempt since the Saudi-led coalition intervened in March last year to support Hadi's government after Huthis overran much of the impoverished country.