CNBC reports that more than 80% of the U.S. companies in Hong Kong surveyed by the American Chamber of Commerce said they’re concerned about China’s plan to impose a new national security law in the city.

Out of the 180 AmCham members that responded to the survey earlier this week, 53.5% were “very concerned,” while 30.0% were “moderately concerned” about the security legislation. The survey results were published on Wednesday and are not intended to be scientific, said the chamber.

Respondents cited concerns such as threats to Hong Kong’s overall business environment, as well as the legislation’s potential impact on freedom of speech and other “basic civil liberties.”

The survey — which the chamber called “a temperature test of members’ sentiment” — came after China’s top legislative body last week approved the proposal to impose a national security law in Hong Kong.