Hackers managed to steal 523 million NEM coins and possibly US$123 worth of Ripple coins from Coincheck's online hot wallet. The Japanese exchange assured its affected customers that the money will be reimbursed upon the completion of the police investigations.
https://www.notebookcheck.net/Cryptohackers-steal-US-500-million-from-Japanese-online-exchange-Coincheck.280404.0.html