Yesterday, in a cryptic move, Anonymous posted a tweet (pictured below) saying that they hoped the New York Stock Exchange would get through today alright. Then, today, out of nowhere, all trading halted on the exchange.
The NYSE specifically denied that it was a hacking incident which had taken it down, but gave no other reason for trading to be stopped. All trades that were currently being executed were canceled without explanation. It was hard to attribute the cause, but other exchanges including the NASDAQ were able to continue trading NYSE stocks without interruption.
Also read: Anonymous Publishes Baltimore P.D. E-Mail & [...]