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Recently, someone managed to kill the library upon which Parity multisig wallets rely upon, and as a result, all the Parity multisig wallets were unable to access the ether in their wallets.
Here's the definitive list of addresses of affected Parity wallets and the amount affected.
There were a total of 584 wallets, of which 400+ accounts have zero balance.
513910.5517
See also http://bit.ly/2Ao3ByB