Social networking site Facebook is experiencing a technical issue with one of its databases that prevents some users from accessing the site.

The admission by Facebook on its site profile comes as a number of users reported problems with signing in to the site and viewing their profiles and other account features.

Some users have experienced difficulty logging into the site for several days, Facebook said. Affected users get an error message that says the site is undergoing maintenance.

Facebook is working on a fix and hopes to have the problem resolved within the next 24 hours. Users can stay updated on the company's website.

This isn't the first time that Facebook users have had problems accessing the site. Facebook was hit by a DoS (denial-of-service) attack in August that kept some users from accessing the site. In September, the company also reported that users had problems accessing services on the site.