Mt gox bitcoin exchange is bankrupt. 850,000 bitcoins lost.

[naokaji]

there is now an official statement on the mtgox website:

At the start of February 2014, illegal access through the abuse of a bug in the bitcoin system resulted in an increase in incomplete bitcoin transfer transactions and we discovered that there was a possibility that bitcoins had been illicitly moved through the abuse of this bug.
As a result of our internal investigation, we found that a large amount of bitcoins had disappeared. Although the complete extent is not yet known, we found that approximately 750,000 bitcoins deposited by users and approximately 100,000 bitcoins belonging to us had disappeared.
We believe that there is a high probability that these bitcoins were stolen as a result of an abuse of this bug and we have asked an expert to look at the possibility of a criminal complaint and undertake proper procedures.
On the same day (24th), we found out large discrepancies between the amount of cash held in financial institutions and the amount deposited from our users. The amounts are still under investigation and may vary but they approximate JPY 2.8 billion.

Also it looks like mtgox was not the only exchange affected, FlexCoin is gone as well after bitcoins where stolen, although it was a much smaller amount.

Flexcoin is shutting down.

On March 2nd 2014 Flexcoin was attacked and robbed of all coins in the hot wallet. The attacker made off with 896 BTC, dividing them into these two addresses:

1NDkevapt4SWYFEmquCDBSf7DLMTNVggdu

1QFcC5JitGwpFKqRDd9QNH3eGN56dCNgy6

As Flexcoin does not have the resources, assets, or otherwise to come back from this loss, we are closing our doors immediately.
Users who put their coins into cold storage will be contacted by Flexcoin and asked to verify their identity. Once identified, cold storage coins will be transferred out free of charge. Cold storage coins were held offline and not within reach of the attacker. All other users will be directed to Flexcoin's "Terms of service" located at "Flexcoin.com/118.html" a document which was agreed on, upon signing up with Flexcoin.


Flexcoin will attempt to work with law enforcement to trace the source of the hack.

[AliG]

Also it looks like mtgox was not the only exchange affected, FlexCoin is gone as well after bitcoins where stolen, although it was a much smaller amount.

That's why I think bitcoin isn't safe enough for general investment. A lot of major players are getting hacked right now