Twitter said Thursday its site was down for many users due to an inadvertent change it had made to its internal systems.
In a tweet, the company wrote that it was working to solve the issue, but that there was no evidence of a security breach or hack.
Outage tracking website Downdetector.com showed more than 55,000 users were being affected by the Twitter outage.
Some users reported problems as early as 5:30PM on the East Coast.
This isn't the first time Twitter has reported issues with its internal systems.
In July, the company reported a breach where hackers accessed its internal systems, and the FBI later launched an investigation into the cyberattack.
The hackers had hijacked some of the social media platform's top voices and used them to solicit digital currency.
Victims of that breach included U.S. presidential candidate Joe Biden and reality TV star Kim Kardashian.