At least 15 civilians were killed on Wednesday, in the southwestern Yemeni city of Taiz, when Houthi militants and their allies fired shells, said medical sources.
More than 70 people were also wounded due to the shelling in the neighbourhoods of Tahrir and Daboua, the source said.
The Iranian-backed Houthis are allied with the forces loyal to the former President, Ali Abdullah Saleh and they are fighting against the Saudi-led coalition.
For the last 7 months strong clashes have been taking place in Yemen, between the Iranian-backed Houthi militias and the Saudi-led coalition.
Saudi Arabia set up the coalition to restore the legitimacy of the Yemeni President, Abd Rabbu Mansour Hadi and started to carry out air strikes against the Houthi militants in Yemen on March 2015.
Hadi came back to the southern port city of Aden in September, after being forced by the Houthi militants to flee his country in March and go into exile in the Saudi capital of Riyadh.
The city of Taiz is one of the largest cities in Yemen and in the recent weeks it has witnessed severe clashes that have caused a lot of damage and forced thousands of Yemenis to feel the area.
In addition to the ongoing battles between the Houthi militants and the Saudi-led coalition, Al Qaeda and ISIS also control large swaths of territory in Yemen.
In the recent weeks, the Saudi-led coalition made advances in the east of Yemen's capital Sanaa and captured Bab al Mandeb, which connects the Red Sea with the Gulf of Aden.
According to the United Nations, around 5,400 people, including more than 2,100 civilians, have been killed in fighting and air strikes since the operations carried out by Saudi-led coalition started on March 26.