I'm kind of behind with the latest bitnews, but anyway:
"In February 2014, the company suspended withdrawals for several days in the face of a distributed denial-of-service.[4] Bitcoin Magazine reported that people behind the attack sent a ransom demand of 75 bitcoins to Kodrič, who refused due to a company policy against negotiating with “terrorrists”.[5] Days after restoring service, Bitstamp temporarily suspended withdrawals for some users as a security precaution due to increased phishing attempts.[6]"
(
http://en.wikipedia.org/wiki/Bitstamp)
"In February 2014, the Mt. Gox company suspended trading, closed its website and exchange service, and filed for a form of bankruptcy protection from creditors called minji saisei, or civil rehabilitation, to allow courts to seek a buyer.[2][3] In April 2014, the company began liquidation proceedings.[4] It announced that around 850,000 bitcoins belonging to customers and the company were missing and likely stolen, an amount valued at more than $450 million at the time.[5][6] Although 200,000 bitcoins have since been "found", the reason(s) for the disappearance—theft, fraud, mismanagement, or a combination of these—are unclear as of March 2014.[7] There has been some speculation of hackers being responsible for the missing Bitcoins, but no case has been proven."
(
http://en.wikipedia.org/wiki/Mt._Gox)
TL;DR
In February 2014 two of the biggest Bitcoin Markets likely underwent a hacker attack. Is that a coincidence? Could it be that the same hacker group went after both of them, with different results?