Onlookers stand behind a police tape near a house where bomb squad officers worked to protect an 18-year-old girl. (Tim Wimoborne/Reuters)

A bomb squad worked for nearly 10 hours to remove the device from the girl, who reportedly stayed calm with the help of counselors. Her parents remained outside the home throughout the ordeal. The police do not have a suspect yet, but suspect it may have been an extortion plan. Her father is the CEO of a large software company.

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Four police in the room with the teenager. Two bomb disposal experts. Two negotiators.less than a minute ago via Mobile Web Favorite Retweet ReplyNick Bryant

More than 9 hours now since teen had possible explosive ‘device’ attached to her in #mosman. Police: operation is ‘intricate’less than a minute ago via Echofon Favorite Retweet ReplyJohn Kerrison

#Mosman Police say they’ve had no contact with whoever left 18-year-old woman attached to what may be a bomb on Sydney’s lower north shore.less than a minute ago via TweetDeck Favorite Retweet ReplySandra Sully

BREAKING: Police have secured the release of the 18-year-old and she has been reunited with her parents.less than a minute ago via web Favorite Retweet Reply3AW 693

NSW Police: The girl’s parents have been amazing and are with their daughter, comforting her now #Mosman.less than a minute ago via web Favorite Retweet Reply3AW 693