U.N. Secretary-General Ban Ki-moon called on Thursday for an immediate investigation of an attack on a school in Syria's Idlib province that the U.N.'s children's agency is calling one of the deadliest of its kind in the country's six-year war.
UNICEF raised its toll for Wednesday's attack to 28 dead, among them 22 children and six teachers.
Ban said in a statement that the attack, carried out against rebel-held territory, may amount to a war crime if found to be deliberate.
"If such horrific acts persist despite global outrage, it is largely because their authors, whether in corridors of power or in insurgent redoubts, do not fear justice. They must be proved...