Dfat concerned about ability to help Australians overseas amid international crises, documents show

He said there would be an additional 1,100 staff by September.

Wong had been told of the approximately 50 Australian or Australian-linked children who remained in detention north-east Syria.

The teenager was believed to have been killed after the prison he was detained in for the last three years was attacked by suspected members of the Islamic State attempting to free fighters.

Yusef was 11 when his parents took him and his siblings to what was then the newly declared IS caliphate in north-east Syria. He was separated from his mother and sister three years later and imprisoned without charge in an adult prison after the fall of IS.

In April, UN experts accused the Australian government of failing its people in Syrian camps and warned of the malnourishment and trauma children in the camps were suffering.

Labor dumped Kathryn Campbell as the department secretary soon after taking office.