The incident coincided with the anniversary of the pro-democracy demonstrations in Tiananmen Square in the capital, Beijing, in June 1989.
On Friday evening, users in different parts of the world were surprised by the blockage of the engine, when the image of “Tank Man”, known worldwide as a symbol of the Tiananmen Square protests, appeared.
The famous photo shows a man, who has not been identified, standing in front of a tank in Tiananmen Square with bags in both hands during the demonstrations.
Hours later, the image reappeared through the Bing engine, owned by the American Microsoft Corporation.
When Microsoft was asked if Bing’s search results were censored like “Tank Man,” the company told CNN in a statement: “This was due to accidental human error and has been resolved.”
While Kenneth Roth, executive director of Human Rights Watch, tweeted, “It’s hard to believe that this was an inadvertent mistake.”
Bing is one of the few search engines allowed in China, which bans other US tech companies, such as Twitter and Facebook.
On Tuesday, the Chinese police prevented the families of the students who were victims of the Tiananmen demonstrations from entering the Wanan Cemetery, west of Beijing, where they were buried.