Shares in Chinese healthcare and technology firms tumbled yesterday after a report that the United States would add more Chinese firms, including the largest commercial drone maker and biotech firms, to investment and export blacklists this week.

Citing two sources briefed on the plans, the Financial Times said the United States would add eight Chinese firms, including the drone maker, DJI Technology Co Ltd, to an investment blacklist today.

The US commerce department is also set to place more than two dozen Chinese firms, some of them involved in biotechnology, on an "entity list" restricting exports to them by US firms, the newspaper cited the sources as saying.

The Financial Times said the US treasury department would put eight companies including DJI on its "Chinese military-industrial complex companies" blacklist because of their alleged involvement in surveillance of the Uyghur Muslim minority.

US investors are barred from taking stakes in companies on the list, which now comprises about 60 firms.