An Australian who has been fighting against the so-called Islamic State (IS) group has been questioned and released by police on his return home.

Ashley Dyball, 23, was detained in Germany last week while on a break from fighting with the Kurdish YPG militia group in Syria.

Dyball’s family said they believed the government should grant him an amnesty.

It is a crime under Australian law to aid militant groups in the Middle East.

The laws are primarily designed to protect Australia from militants returning home after fighting alongside IS.

On Facebook, where he uses the name Mitchell Scott, Dyball had said last week he had been detained in Germany and could be “deported” to Australia to face charges.

He arrived home on Sunday evening and was greeted at Melbourne airport by his family and supporters.

It was unclear whether or not he had been deported.

He was questioned but released without charge pending further investigations and has now traveled back to his home in Brisbane.