UNITED NATIONS, Aug. 15 (Xinhua) -- UN Secretary-General Ban Ki-moon on Monday condemned an airstrike on a Yemeni hospital operated by the humanitarian association Doctors Without Borders, calling on all parties to end hostilities and find a negotiated solution.
On Monday, at least 20 people were killed and 15 others wounded when Saudi-led warplanes attacked the hospital in the northwest province of Hajja.
"Hospitals and medical personnel are explicitly protected under international humanitarian law and any attack directed against them, or against any civilian persons or infrastructure, is a serious violation of international humanitarian law," said a statement released by Ban's spokesperson.
Yemen has been locked in a civil war since the Houthis seized power and overturned the Yemeni government in late 2014.
Saudi Arabia and its allies intervened to support exiled the Yemeni government in 2015, but failed to bring it back to power in the rebel-held capital Sanaa.
The war and ensuing airstrikes have killed over 6,400 people, mostly civilians. According to the UN, over 70 health centers have been damaged or destroyed in the conflict.