Intelligence agencies suspect an Australian baby has been murdered by Islamic State terrorists in a retribution-style attack.

News Corp reported that the baby’s father was believed to be an Australian foreign fighter who had contacted Australian authorities to seek assistance to flee the bloody conflict zone in Syria and Iraq.

Attorney-General George Brandis said he would not support any parent who placed themselves or their family in danger in Islamic State territory.

“The government has consistently said going to the conflict zone puts yourself and others in danger,” Mr Brandis’s spokesman told News Corp.

“We condemn any parent who takes their family to the conflict zone.”

The Federal government refused to comment on specific security or intelligence matters, failing to confirm the age of the child, its gender and the circumstances of the baby’s death.

Radicalised Australian men in Syria and Iraq were thought to have been encouraged to marry and have children who could serve as their successors as “Islamic caliphate with the terror army”, News Corp reported.

Islamic State confiscates passports and controls the financial resources of its fighters to prevent them from attempting to escape the conflict zone.

It is understood the Australian government has expected an increase in the number of foreign fighters trying to return home to Australia after becoming disillusioned with the realities of joining the Islamic State terror army.

Meanwhile other Australians are expected to continue their mission in carrying out terror attacks overseas.

There are about 100 Australians currently fighting alongside terrorist organisations in the Middle East, but the number of Australians in Syria and Iraq conflict zone is not public knowledge.

Former Islamic State recruiter, originally from Melbourne, Neil Prakash remains in a Turkish prison after being arrested at the border late last year when he fled Mosul.

Australian authorities continue efforts to extradite the 25-year-old back to Melbourne, where a warrant was issued for his arrest in 2015.

United States Department of Homeland Security officials visited Canberra last week to meet with ASIO to discuss the threat of returning foreign fighters.