The German accused of murdering his then-girlfriend in Australia has now been released on bail.

The public prosecutor's office decided not to appeal against the release of the ex-boyfriend of Simone Strobel, who was killed 17 years ago, the Australian news agency AAP reported on Thursday.

A court in Sydney has decided to allow the 42-year-old's release.

After that, the public prosecutor's office had initially announced that they wanted to lodge an objection.

The accused can now return to his family in Western Australia subject to conditions.

The bail conditions include that the defendant must report to a police station three times a week and surrender his passport, according to the court order.

He is also not allowed to use encrypted communication services such as Whatsapp.

She came to Australia from Lower Franconia in 2005

Strobel's ex-boyfriend was taken from his home in Perth, Western Australia, a week ago and flown to Sydney.

There he was charged with murder.

The arrest was a surprising twist in the case, which remains unsolved despite thorough investigations.

The 25-year-old kindergarten teacher Simone Strobel from Lower Franconia was traveling with her then 24-year-old boyfriend in a mobile home in Australia in 2005.

Later, the friend's sister and her friend from Germany joined them.

The four were at a campsite in Lismore, north of Sydney, when Strobel suddenly disappeared.

A few days later, her body was found under palm fronds near the campsite.

Dowing Local Court Judge Margaret Quinn accused the prosecution on Thursday of having presented little evidence to support their allegations.

Although there is evidence that Strobel and her then-boyfriend argued and drank shortly before the murder, "there does not appear to be any direct or indirect evidence in this case linking him to the crime," the judge said.

"This is not the strongest circumstantial case I've seen."