The email read: "Twitter believes that your account may have been compromised by a website or service not associated with Twitter. We have reset your password to prevent accessing your account.”

Later in a statement, the firm admitted that it had been the victim of nothing more than a system error.

“We unintentionally sent some password reset notices tonight due to a system error. We apologize to the affected users for the inconvenience,” said a spokesperson from Twitter while giving the clarification.

In February last year, anonymous hackers attacked Twitter and gained access to passwords and other information for as many as 250,000 user accounts.

Twitter had confirmed the news on its blog post.  Twitter revealed that the passwords were encrypted and that it had already reset them as a 'precautionary measure'. The blog post claimed that Twitter was in the process of notifying affected users.