The UN human rights chief on Friday (July 26th) condemned "international indifference" in the face of mounting deaths in Syria, warning that those responsible for airstrikes targeting civilians could be charged with war crimes, AFP reported.

Since late April, the Syrian regime and Russia have stepped up deadly raids on the Idlib region.

UN High Commissioner for Human Rights Michelle Bachelet said she was alarmed at "the apparent international indifference to the rising civilian death toll caused by a succession of airstrikes in Idlib".

Bachelet stressed that medical facilities, schools, markets and other clear civilian targets have been hit.

"These are civilian objects, and it seems highly unlikely, given the persistent pattern of such attacks, that they are all being hit by accident," she said in a statement.

"Intentional attacks against civilians are war crimes, and those who have ordered them or carried them out are criminally responsible for their actions."

More than 730 civilians have been killed in Idlib in airstrikes and ground-to-ground fire by the Syrian regime and its allies since late April, according to the Syrian Observatory for Human Rights.