Fighting between loyalist forces and Shiite Huthi rebels and their allies intensified on the outskirts of the flashpoint city of Taez, killing four soldiers and five insurgents, military officials said.
Pro-government forces pressed on with a three-day-old offensive to recapture the presidential residence and police headquarters in the southwestern city, they said, as rebels brought in reinforcements.
Further to the east, seven rebels and five soldiers were killed in clashes in Shabwa province, as both parties fought for control of the oil-rich Usaylan region, other military sources said.
Six other rebels were killed in an ambush in the central province of Baida, the officials said.
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The fighting continued despite Kerry's announcement of a new ceasefire starting today.
The US chief diplomat said today that rebels were ready to observe a ceasefire plan taking effect from November 17, but Yemeni President Abedrabbo Mansour Hadi's government said it was not aware of any new peace initiative.
The Huthis and the party of their ally, former president Ali Abdullah Saleh, confirmed their commitment to the truce, in a statement on the rebel television channel Almasirah's website.
But the spokesman of the Saudi-led coalition, Major General Ahmed Assiri, told AFP: "Until now there is no demand from the legitimate government (of Yemen) to observe a ceasefire.
"Consequently, the operations of the Yemeni army, supported by the coalition, will continue," .
Six attempts to clinch a ceasefire in Yemen have foundered, including a three-day October truce that fell apart as soon as it went into force.
The UN says more than 7,000 people have been killed and nearly 37,000 wounded in Yemen since the Arab coalition launched a military campaign in March 2015 in support of the government against the Iran-backed rebels.
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