After posting on the anniversary of the 1989 Tiananmen Square crackdown, Chinese social media app Xiaohongshu's account was blocked.
It had written on the microblogging site Weibo, "Tell me loudly: what is the date today?"
The post was quickly removed from the site's 14 million followers.
Its Weibo page has been replaced with a message stating that it is being prosecuted for law and regulation violations.
Xiaohongshu has yet to make a public statement about the situation. Its Weibo account remained locked as of Monday morning, but the app - which has an estimated 300 million users - was still operational.
It's unclear if the post was meant to allude to the crackdown.
According to Wall Street Journal, a person familiar with the situation said the post was not made in honour of the anniversary.
The 4 June 1989 Tiananmen Square crackdown is a highly sensitive topic in China, with the ruling party routinely suppressing attempts to commemorate the day when Chinese troops suppressed pro-democracy demonstrations in Beijing.