The company, which has 320 million active users, tweeted that it is aware of the issue and is trying to fix it. The announcement was sent at 3:41 a.m. Eastern Time.
The @Support announcement was not visible when accessed from a personal computer, which showed a blue screen with an error message saying "something is technically wrong." The message was visible on Twitter's mobile app.
Users said the service was not accessible on desktop computers. Twitter's blog posts, corporate info and most other pages on the Twitter.com website were also inaccessible, displaying the blue error screen.
Twitter's mobile app was partially functioning for some users but its timeline updated new tweets sporadically. Its search function appeared disabled as some hashtags or keyword searches returned no results. Users' profile pages appeared to be accessible from the mobile app.
Third party services, such as the TweetDeck service, also returned a blank page.