The arrests came after a boy, 13, set off a bomb in the store managed by his family. Officers later arrested a 14-year-old suspected of making the explosives.

其中，一13岁男孩涉嫌用该炸药引爆自家经营的小店，另一14岁男孩涉嫌根据网上资料生产该炸药。

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The island has had a varied career over the years, serving as a convict stockade, explosives store, police station, boat yard and film set.

BBC: The islands of Sydney Harbour

It now wants everybody who handles high-power rocket engines to have a federal explosives license and a bunker to store them.

FORBES: Serious Toys