The New York Times reports that the market also opened at 2346.98, which some people found to be eerily similar to the date of Tiananmen (6/4/89), plus 23 for 23rd anniversary.

Some suspect the work of hackers, and in response to the significance some Chinese were placing on the drop, the country’s censors sprang to action.

Internet access through China, which is already heavily censored, blocked search terms such as “stock market” and “Shanghai stock” (and even “black clothes,” “silent tribute” and “today,” which could refer to the candlelight vigil held every year on the anniversary of Tiananmen, where participants wear mostly black).

The Times reports that over 80,000 people—possibly as many as 180,000—turned out to remember Tiananmen.