South Korean Bitcoin exchange Youbit shuts after second hack attack

A crypto-currency exchange in South Korea is shutting down after it was hacked for the second time in less than eight months.
Youbit, which lets people buy and sell bitcoins and other virtual currencies, has filed for bankruptcy after losing 17% of its assets in the cyber-attack.
It did not disclose how much the assets were worth at the time of the attack.
In April, Youbit, formerly called Yapizon, lost 4,000 bitcoins now worth $73m (£55m) to cyberthieves.
Crime wave