UPDATE, 3:30 p.m.: The NYSE trading halt is over.

UPDATE, 2:14 p.m.:  NYSE President Tom Farly told CNBC that the market will re-open on Wednesday.


UPDATE, 1:43 p.m.:  A Twitter account connected to the hacking group Anonymous (@YourAnonNews) sent out a tweet on Tuesday that may have foreshadowed Wednesday morning's New York Stock Exchange trading halt:

UPDATE, 12:55 p.m.:  The New York Stock Exchange Twitter account sent out a series of tweets stating that the issue is technical, not a "cyber breach." Marketwatch reports that President Obama has been briefed on the trading halt and that the Treasury Department and White House aer "monitoring the situation."   

--The New York Stock Exchange suspended the trading of all listed stocks just before noon on Wednesday. In an alert on NYSE.com, no explanation for the halt was given, but it is noted that "additional information will follow as soon as possible." The alert also explains that all open orders are being cancelled. "We're currently experiencing a technical issue that we're working to resolve as soon as possible," the NYSE told CNBC on a live broadcast, according to Business Insider. "We will be providing further updates as soon as we can, and are doing our utmost to produce a swift resolution, communicate thoroughly and transparently, and ensure a timely and orderly market re-open."

CNBC reporter Carl Quintanilla pointed out on Twitter that the official @NYSE account reported a "technical issue" as early as 8 a.m. on Wednesday.

This is not the first time the New York Stock Exchange has had technical issues, but according to The New York Times, this halting of trades "has little precedent."