Suspected Hayat Tahrir al-Sham gunmen walked off with thousands of dollars worth of Canadian-financed electronics devices, according to declassified documents.

Zau Seng had traveled to Syria and Iraq several times to treat people injured on the front lines and document abuses.

The U.N. deputy humanitarian chief warned Tuesday that further military operations in northwest Syria's Idlib province will overwhelm aid efforts, stressing that an estimated 3 million people are caught up in crossfire in the last rebel stronghold.