Attack on school in Syria's Idlib kills 22 children, six teachers

According to Lake, the attack was the deadliest since the Syrian war began in 2011.

"Twenty-two children and six teachers were reportedly murdered today when their school compound was repeatedly attacked in Idlib, Syria. This is a tragedy. It is an outrage. And if deliberate, it is a war crime," Lake said in a statement on Wednesday.

Since 2011, Syria has been engulfed in a civil war, following the protests that had turned violent, as part of the so-called Arab Spring. During the conflict, hundreds of thousands Syrians have been killed and millions more have been displaced.