GreatFire.org, a China-based freedom of speech advocacy group, said in a statement on Tuesday that Bing was filtering out both English and Chinese language search results for terms such as ‘Dalai Lama’, the exiled Tibetan spiritual leader whom Beijing brands as a violence-seeking separatist, charges he denies.
Microsoft, responding to the rights group's allegations, said a system fault had removed some search results for users outside China.
The company has in the past come under fire for censoring the Chinese version of internet phone and messaging software Skype.
"Due to an error in our system, we triggered an incorrect results removal notification for some searches noted in the report but the results themselves are and were unaltered outside of China," Stefan Weitz, senior director for Bing, said in a statement emailed to Reuters on Wednesday.
Weitz did not say if the error had been fixed and Microsoft officials in Beijing declined to elaborate.
Microsoft sent a shortened version of the statement to China-based media organisations which omitted
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