The UN Secretary-General has called for an “independent investigation” into the Saudi coalition strike on a bus in Yemen which killed at least 50 people, mostly children, and injured over 70 others. While the coalition called the attack “legitimate,” António Guterres condemned the strike and the UN reminded all parties to the conflict that they “must take constant care to spare civilians and civilian objects in the conduct of military operations,” UN spokesman Farhan Haq said in a statement. The Head of the UN Children’s Fund (UNICEF), meanwhile, called on the parties to bring an end to the three-year-long conflict. “Attacks on children are absolutely unacceptable,” Henrietta Fore said on Twitter. “I’m horrified by the reported airstrike on innocent children, some with UNICEF backpacks. Enough is enough.”