DUBAI: Thirteen people, including children, were killed in air strikes in Yemen's northern province of Saada, the rebels and medical sources said Tuesday, as international aid groups condemned the raids.

Iran-backed Huthi rebels and Yemen's internationally-recognised government - supported by a Saudi-led military coalition - have been at war since 2014, creating what the United Nations calls the world's worst humanitarian crisis.

The Huthis' Al-Masirah TV said 13 people, including four children, were killed late Monday in coalition air strikes on their vehicle in the rebel stronghold of Saada. Medical sources confirmed to AFP that four children were among those killed. "We're horrified to learn of the deaths of 13 civilians, including four children, today in Yemen," said the country director for Save the Children, Xavier Joubert.-AFP