Two children were killed on Tuesday when mortar shelling hit residential houses in Yemen's southern Red Sea port city of Hodeidah, local medics said.

Two other children were wounded in the shelling on the government-controlled Hays district, they said.

It was the latest in a series of such accidents in Hodeidah since the government and the Houthi rebels reached a UN-sponsored cease-fire agreement in Stockholm in December 2018.

The Houthi rebels control much of the port city, while the government forces have advanced to the southern districts.

Yemen has been mired in civil war since late 2014, when the Iran-backed Houthi group seized control of much of the country's north and forced the Saudi-backed government of President Abd-Rabbu Mansour Hadi out of the capital Sanaa.