Islamic State In Iraq And The Levant (ISIL) Fighters
IN PHOTO: Fighters from Islamic State in Iraq and the Levant (ISIL) hold their weapons as they stand on confiscated cigarettes before setting them on fire in the city of Raqqa, April 2, 2014. Reuters/Stringer

Australia has been warned not to allow home-grown terrorists from returning to the country. A former Al Qaeda fighter who became an informant for the Central Intelligence Agency suggested that the Australian government should cancel their passports in a time of "war."

Morten Storm told ABC that people have declared war against Australia, referring to the extremist group ISIS. He said Australian extremist fighters may use their passports as a tool to "become a terrorist." The CIA informant is a Danish national who was once a member of bikie gangs before converting to Islam. He revealed that Islam for him was a "model way of life" for him to follow which he needed badly at that time of his life.

After his conversion to Islam, he travelled to Yemen where he was convinced by Al Qaeda militant Anwar al-Awlaki to join the "violent jihad." He revealed in the show that he was a trusted messenger of al-Awlaki since he had built a strong relationship with him.

It was only when he failed to join the fight in Somalia because of a change in plans when he abandoned radical Islam. He contacted a Danish intelligence agent and said he wanted to help in fighting the terrorists.

Storm began working as an informer for the Danish, British and U.S. intelligence while pretending to play the role of a married Muslim man. The intelligence agencies used Storm's relationship with al-Awlaki to capture him in Yemen. The Al Qaeda leader was eventually killed in 2011. However, Storm's relationship with the intelligence agencies had soured when they reportedly failed to give him credit and reward for his role in toppling the terror network.

He warned of Australian teens like Abdullah Elmir who was recently seen in an ISIS propaganda video. Storm believes Elmir may have been influenced by the same factors which had convinced him in his youth several years ago. He said ISIS propaganda videos are dangerous since they are used as propaganda tools. Storm suggested that governments should ban the dissemination of ISIS-related videos. Australians fighting alongside ISIS believe they are part of the Islamic Ummah or an Islamic nation, he said.

Meanwhile, two of the four brothers from Sydney who were recruited to ISIS were reportedly deemed too "obese" to fight with the extremist group. Their mother was shocked when she received a text message from one of her sons, telling her he and his brothers had arrived in Syria, according to reports. The mother appealed to her sons to return home.