Australian police are battling to defuse a suspected bomb believed to be strapped to a teenage girl's neck at her multimillion-dollar mansion in Sydney.
A teenage girl who had a "collar bomb" strapped to her neck in a 10-hour terrifying ordeal at her multimilllion-dollar Australian home is now safe, police have said.
Madeleine Pulver, 18, told detectives a stranger wearing a balaclava broke into her family's home in the wealthy suburb of Mosman and attached her to the device.
The teen called police after the culprit left a ransom note and fled the house in Burrawong Avenue - an exclusive street home to many prominent Australians.
Bomb squad detectives rushed to the scene and a 250m exclusion zone was enforced.
Authorities believe she was the victim of an extortion attempt to get money out of her businessman father, Bill Pulver.
A police source said the unusual "collar bomb" used had never been seen before in Australia.
Bomb squad officers swarmed the property in the plush harbourside suburb of Mosman after the young woman called police.
The girl is understood to be part of one of Sydney's wealthiest families and is in her final year of high school.