More than a dozen civilians, most of them schoolchildren, have been killed in the latest round of airstrikes by Saudi warplanes on residential areas in Yemen's west-central province of Sana'a and the southwestern province of Ta'izz.

Youssef al-Hazzari, a spokesman for the Yemeni Ministry of Public Health and Population, said at least 13 people lost their lives and 92 others sustained injuries after Saudi warplanes launched aerial assaults against an area in the Sa'wan district of Sana'a on Sunday evening. He said most of the victims were schoolchildren.

Hazzari also condemned the incident as a war crime, saying, “On the World Health Day, April 7, which carries the slogan 'Health for All', the Saudi-led coalition of aggression marked the event in its well-known manner.”

The photo shows a Yemeni schoolgirl killed in Saudi airstrikes in the Sa’wan district of Yemen's west-central province of Sana’a on April 7, 2019. (Photo by the media bureau of Yemen’s Houthi Ansarullah movement)

He called on the international community to shoulder its responsibility for the crimes being committed by Saudi Arabia and its regional allies against Yemeni people.

Meanwhile, Yemeni Health Minister Taha al-Mutawakel said the massacre points to the Saudi-led coalition’s total disregard for international and humanitarian treaties and laws.

Mutawakel reiterated that the failure of the international community to impose sanctions on the perpetrators of such crimes has emboldened them to continue targeting Yemeni people.

Yemenis visit a cemetery in the capital Sana’a on April 5, 2019. (Photo by AFP)

The official called on international humanitarian organizations to condemn the carnage, not to remain silent about the crimes being committed against the Yemeni nation, and exert pressure aimed at stopping the Saudi-led aggression.

The Yemeni health minister further stressed the importance of effective measures to hold the perpetrators of these crimes accountable at international courts.

Earlier in the day, a woman was killed and two others were injured when Saudi military aircraft struck a house in the Dimnat Khadir district of Ta'izz.

Saudi Arabia and a number of its regional allies launched the devastating campaign against Yemen in March 2015, with the goal of bringing the government of former President Abd Rabbuh Mansur Hadi back to power and crushing the Houthi Ansarullah movement.

According to a report by the Armed Conflict Location and Event Data Project (ACLED), a nonprofit conflict-research organization, the Saudi-led war has so far claimed the lives of about 56,000 Yemenis.

Women are treated for suspected cholera infection at a hospital in Sana’a, Yemen, on March 28, 2019. (Photo by The Associated Press)

The war has also taken a heavy toll on the country’s infrastructure, destroying hospitals, schools, and factories. The UN has already said that a record 22.2 million Yemenis are in dire need of food, including 8.4 million threatened by severe hunger. According to the world body, Yemen is suffering from the most severe famine in more than 100 years.