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Six orphans born to families belonging to the Islamic State group arrived in Brussels on Thursday after being repatriated by Belgium. The children were handed over from Kurdish authorities in northeast Syria, officials said.

"Six Belgian orphan children were handed over to a delegation from the Belgian foreign ministry," spokesman Kamal Akef said.

"The children and Belgian delegation have arrived in their country."

Top foreign affairs official Abdulkarim Omar, using an alternative acronym for IS, earlier said the "children from ISIS families" were repatriated "at the request of the Belgium government".

Belgium had announced the transfer of the children from Kurdish-controlled camps in Syria after the deaths of their militant parents.

"These are children who were born in our country and who today no longer have parents," Belgian Finance Minister Alexander De Croo told VRT public radio.

Belgium is one of several European countries wrestling with the dilemma of what to do about citizens trapped in Syria following the defeat of IS.

Some are reticent to accept captured extremist fighters, but the cases of children and non-combatant wives have proved more complicated for Western authorities.

On Wednesday, Foreign Minister Didier Reynders said Belgium signed a deal to allow returnees to transit through Iraq's autonomous Kurdish region.

The bulk of IS fighters and family members who were captured when its so-called caliphate collapsed are being held in Syria in Kurdish-run camps.

De Croo said that four of the six orphans expected to return were older than 10, but that none were suspects.

"These are children who were alone in the camps, who have no support. There's no question of taking back parents who chose to join terrorist groups," he said.

"These children had no choice," he added.

According to Belgian media reports, 50 to 60 Belgian children under 18 are in the camps of al-Hol, Roj, and Ain Issa in Syria.

Al-Hol houses approximately 74,000 people, 65 percent of whom are children according to .

The UN has expressed grave concerns for the camp's residents, many of whom underwent a gruelling few months holed up in Baghouz and making the journey to the camp.

According to a World Health Organisation (WHO) spokesman, at least 106 children died upon their arrival or on their way to al-Hol camp since 2018.

Overcrowding and a shortage of health and sanitation facilities in the camp have worsened the residents' situation, especially during adverse weather conditions over the winter months.

Belgium was one of the European countries which, relative to its size, saw one of the larger contingents of extremists set off for the Syrian battlefield.

Read more: Iraq proposes 'pay-to-prosecute' for Islamic State foreign fighters

Authorities estimate that 400 adults have headed to militant-controlled areas since 2012 and 150 were still considered "active and in place" at the end of last year.

Syria's Kurds have detained hundreds of foreigners suspected of fighting for IS, as well as thousands of related women and children, during the US-backed battle against IS in Syria.

With backing from the US and international coalition, the Kurdish-led Syrian Democratic Forces expelled the extremist group from its last patch of territory in the eastern Syrian village of Baghouz in March, after larger than expected numbers of families emerged from the ruins.