Yemeni officials and witnesses say rebel attacks have killed at least 10 pro-government forces in the key port city of Hodeida.
They say the clashes, which flared up Wednesday, wounded at least seven civilians when shells hit their residential areas in the contested Red Sea city.
The officials demanded anonymity because they weren't authorised to brief reporters.
Witnesses asked for anonymity for fear of reprisals.
Yemen's internationally recognised government accused the Houthi rebels of using UN facilities in Hodeida to attack its forces.
It says the attack killed at least 10 troops, and wounded 20 others.
The fighting came over two months after the Houthis claimed withdrawal from the port city of Hodeida, a move criticized by the government as a "farce.
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