Clashes erupted between government forces and Houthi rebels in the coastal city of Al-Hudaydah on Sunday, according to a Yemeni government source.
Government sources blamed the rebels for triggering the clashes after pounding positions of government forces in the city.
There was no comment from the Shia Houthi group on the claim.
On Saturday, the Yemeni army said 12 civilians had been killed and injured in Houthi shelling south of Al-Hudaydah.
The fresh violence comes amid accusations between the Yemeni government and rebels of violating a UN-brokered ceasefire deal in the strategic city.