Microsoft's Bing search enginehas been blocked in China with social media users fearing it could be the latest foreign website to be blocked by censors.

Attempts to open cn.bing.com has resulted in an error message for users since Wednesday, taking away the most prominent foreign search engine available in China.

"We've confirmed that Bing is currently inaccessible in China and are engaged to determine next steps," a Microsoft spokesperson said in a brief statement, hours after saying the company was investigating the matter.

China's Communist authorities operate an online censorship apparatus known as the "Great Firewall", which blocks a slew of websites including Facebook, Twitter and several...