Google services in China have been disrupted ahead of the Tiananmen Square protest's 25^th anniversary this week.

Based on a GreatFire.org report cited by The Independent, the Chinese government seemed to have blocked Google Inc's search engine and email services starting last week. Other Google services have also been inaccessible to many Chinese users just a few days before the 25^th anniversary of the 1989 pro-democracy Tiananmen protest.

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According to Google, the last time it had detected a similar block was in 2012. Back then, the disruption only lasted for 12 hours, but this one has gone for four days already.

A Google spokesman confirmed that their system is going well on their end. However, the company's transparency report showed a significantly lower traffic from China beginning Friday, which could mean a disruption had occurred.

In 2010, Google Inc had pulled out its Chinese search engine service from China because of the government's censorship, and now runs the service from Hong Kong. Other popular foreign sites such as Facebook, Twitter, and YouTube have already been blocked by the Chinese government.

The 1989 Tiananmen Square demonstrations in Beijing are still considered taboo by the ruling Communist Party. Last month, the government has detained activists including rights lawyer Pu Zhiqiang for attending a meeting concerning the protests.

In Hong Kong, the 1989 incident is commemorated every year. However, in mainland China, the event's anniversary has been deliberately blocked out from public calendars.

China's government has also refused to release a death toll for the deadly protest where troops fired their way in towards central Beijing. According to human rights groups and several witnesses, the death toll is estimated to be between several hundreds and several thousands.

At present, China has enforced strict censorship on online content and the government has continued to further tighten the controls.

Meanwhile, Chinese citizens have taken to local social media site Weibo their complaints about the government's blockage of Google services.