It is reported that bloggers in China have not been able to access their accounts since May 17. Google is reported to be "working to restore access to Blogger in China."
The Chinese pages at bbc.co.uk/chinese are also currently blocked. YouTube.com is blocked as well.
Here is the iconic moment from twenty years ago:
And here was the story:
Several hundred civilians have been shot dead by the Chinese army during a bloody military operation to crush a democratic protest in Peking's (Beijing) Tiananmen Square.
Tanks rumbled through the capital's streets late on 3 June as the army moved into the square from several directions, randomly firing on unarmed protesters.
The injured were rushed to hospital on bicycle rickshaws by frantic residents shocked by the army's sudden and extreme response to the peaceful mass protest.
Demonstrators, mainly students, had occupied the square for seven weeks, refusing to move until their demands for democratic reform were met.
The protests began with a march by students in memory of former party leader Hu Yaobang, who had died a week before.
But as the days passed, millions of people from all walks of life joined in, angered by widespread corruption and calling for democracy.
Tonight's military offensive came after several failed attempts to persuade the protesters to leave.
Throughout the day the government warned it would do whatever it saw necessary to clamp down on what it described as "social chaos".
But even though violence was expected, the ferocity of the attack took many by surprise, bringing condemnation from around the world.
US President George Bush said he deeply deplored the use of force, and UK Prime Minister Margaret Thatcher said she was "shocked and appalled by the shootings".
Amid the panic and confusion students could be heard shouting "fascists stop killing," and "down with the government".
At a nearby children's hospital operating theatres were filled with casualties with gunshot wounds, many of them local residents who were not taking part in the protests.
Early this morning at least 30 more were killed in two volleys of gunfire, which came without warning. Terrified crowds fled, leaving bodies in the road.Meanwhile reports have emerged of troops searching the main Peking university campus for ringleaders, beating and killing those they suspect of co-ordinating the protests.