(CNN) -- Foreign correspondents in at least two Beijing, China, bureaus of news organizations have had their Google e-mail accounts attacked, with e-mails forwarded to a mysterious address, according to the Foreign Correspondents' Club of China.

In an advisory posted on its Web site, the organization advised members how to check if their Gmail had been compromised and urged caution when clicking on links and e-mail attachments. The advisory did not name the news organizations affected.