BitFinex has just been hacked. They lost their hot wallet to a malicious actor. However, due to security practices only a relatively minimal amount has been lost. BitFinex keeps over 99.5% of its customers deposits in secure multisig wallets, so only 0.5% at most was lost.
BitFinex is a digital currency trading platform and states itself as currently in a beta phase (testing phase), though they have been in the market for a while now.
They have a notable amount of trade and are considered by many to be one of the market leaders.
Customers are being asked to cease depositing cryptocurrency to old deposit addresses. They suspect that their hot wallet keys have been compromised.
They are currently in the processes of creating, what we can only assume, will be a more secure hot wallet. And that they will have further information within the next few hours.