This Is the Message Anonymous Posted Last Night Before the New York Stock Exchange Outage

The night before the New York Stock Exchange temporarily suspended trading due to an "internal technical issue," the hacker collective Anonymous had a cryptic message for Wall Street on Twitter.

"Wonder if tomorrow is going to be bad for Wall Street.... we can only hope," said the tweet posted at 11:45 p.m. Tuesday.

Wonder if tomorrow is going to be bad for Wall Street.... we can only hope.

— Anonymous (@YourAnonNews) July 8, 2015

The NYSE said it was experiencing a technical issue Wednesday afternoon and said it was not the result of a cyberbreach. Both the Department of Homeland Security and the White House said there was no indication of malicious actor involvement.

"We’re experiencing a technical issue that we’re working to resolve as quickly as possible," the NYSE said in a statement. "We're doing our utmost to produce a swift resolution & will be providing further updates as soon as we can."

"The issue we are experiencing is an internal technical issue and is not the result of a cyber breach," the statement continued. "We chose to suspend trading on NYSE to avoid problems arising from our technical issue. NYSE-listed securities continue to trade unaffected on other market centers."

Still, Eric Scott Hunsader, a market structure expert told CNN that Wednesday's outage was "the most significant outage since Nasdaq's blackout" in 2013.

The NYSE resumed trading shortly after 3 p.m. Eastern time after nearly four hours.

(1 of 2) We’re experiencing a technical issue that we’re working to resolve as quickly as possible.

— NYSE (@NYSE) July 8, 2015

(2 of 2) We're doing our utmost to produce a swift resolution & will be providing further updates as soon as we can.

— NYSE (@NYSE) July 8, 2015

(1 of 3) The issue we are experiencing is an internal technical issue and is not the result of a cyber breach.

— NYSE (@NYSE) July 8, 2015

(2 of 3) We chose to suspend trading on NYSE to avoid problems arising from our technical issue.

— NYSE (@NYSE) July 8, 2015

(3 of 3) NYSE-listed securities continue to trade unaffected on other market centers.

— NYSE (@NYSE) July 8, 2015