Twitter has told users they may not be able to tweet or reset passwords after an 'incident'.
Users had been reporting issues with the social media site in the hours after multiple celebrities were hacked.
A series of high-profile Twitter accounts were hijacked on Wednesday, with some of the platform's top voices - including U.S. presidential candidate Joe Biden, reality television show star Kim Kardashian, former U.S. President Barack Obama, billionaire Elon Musk, and rapper Kanye West, among many others - used to solicit digital currency Bitcoin.
The cause of the breach was not immediately clear, but the unusual scope of the problem suggested that it was not limited to a single account or service.
While account compromises are not unusual, experts were surprised at the sheer scale and coordination of the Wednesday's incident.
It is unclear if the latest issues relate to the hackings.
Initially, there were reports that verified accounts were not able to tweet.
Downdetector.com has been receiving reports of problems since around 10pm.
Forty-two percent are on the IOS app, 34 percent on the website and 22 on the Android app.
We'll be bringing you the very latest updates, pictures and video on this breaking news story.
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