Update 3:30 p.m. EST: On its status blog, Twitter released an official update on what happened. 

During a planned deploy in one of our core services, we experienced unexpected complications that made Twitter unavailable for many users starting at 11:01am. We rolled back the change as soon as we identified the issue and began a controlled recovery to ensure stability of other parts of the service. The site was fully recovered by 11:47am PDT. We apologize for the inconvenience. 

Update 2:59 p.m. EST: UK users reported that they have not noticed any problem in service. Twitter also appears to still work normally for people using the official Twitter app for Android. Twitter has not yet updated its status blog, but the Twitter website seems to have returned to some users. 

Sometime around 2:00 p.m. EST on Tuesday, Twitter Inc. (NYSE: TWTR) went down across nearly all platforms, including the Twitter website.

Other users lost Twitter service as early as 1:30, but Mashable noted that Twitter had been behaving oddly all morning.

Users trying to access Twitter are instead greeted with the following warning page:

“Most users are experiencing issues accessing Twitter on web and mobile apps,” Twitter said on the official Twitter Status blog. “We’re looking into it.”

When asked, Twitter told the International Business Times what they are "looking into it," and that it will post updates to the status blog as they become available. 

Twitter had a “brief service issue” on March 2, but Twitter hasn’t experience a widespread outage since September 2013.

How you still able to access Twitter? Let us know which platform you are using in the comments.