HONG KONG — Chinese authorities are quietly scrutinizing technology products sold in China by Apple and other big foreign companies, focusing on whether they pose potential security threats to the country and its consumers and opening up a new front in an already tense relationship with Washington over digital security.

Apple and other companies in recent months have been subjected to reviews that target encryption and the data storage of tech products, said people briefed on the reviews who spoke on the condition of anonymity. In the reviews, Chinese officials require executives or employees of the foreign tech companies to answer questions about the products in person, according to these people.

The reviews are run by a committee associated with the Cyberspace Administration of China, the country’s Internet control bureau, they said. The bureau includes experts and engineers with ties to the country’s military and security agencies.

While other countries, including the United States and Britain, conduct reviews of some tech products, they usually focus on products that will be used by the military or other parts of the government that are concerned with security, and not on products sold to the general public.