Just Stop Oil on Twitter urged the UK government to stop all new fossil fuel projects.
Media reported that the incident forced a 24-hour suspension in the match between Robert Milkins and Joe Perry.
Video since shared by the Just Stop Oil Twitter account captures the exact moment in which two environmental activists storm a pair of game tables, with one successfully managing to jump atop and throw powder.
Although two security guards quickly bundled the activist away, the damage had long been done.
There was also a female protester, who tried to glue herself to the other table during the match between Mark Allen and Fan Zhengyi, but was stopped.
Play was suspended on both tables immediately. The table cloth on one table was damaged beyond repair, prompting officials to have it replaced overnight.