Do not change Twitter passwords

Microblogging website Twitter is warning its millions of users not to change their login details as it investigates a potential problem.

Some users have been locked out after trying to reset passwords or change other details.

"This seems to affect new users as well as long-term users; we do not advise changing your user name, email address, or password at this time. We will update Status with more news as it becomes available," said Twitter.