Twitter has apparently asked a portion of users to reset their passwords. What at first appeared to be the result of a hacking attempt has turned out to be caused by an accident in the system. No user information was compromised, although some users have been temporarily locked out of their accounts.
The incident happened yesterday, with less than 1-percent of all users receiving the warning email. Re/code was told by a Twitter spokesperson that it was an accident. Users who have received the email are able to access their accounts after updating their password information.
While this particular accident is harmless, Twitter was actually hacked around the same time last year (it was in early February); with some 250,000 user account compromised and information stolen. So it wouldn’t hurt to change passwords at this moment anyway.