China said it had started an antitrust investigation of Google, which works with Chinese companies on smartphones and advertising outside the country.

The Chinese government's move to open an antitrust probe into Google is the latest development in a long and tangled relationship that goes back to the early 2000s. The investigation was one of a flurry of Chinese retaliatory measures announced Tuesday in response to a 10% tariff imposed by U.

Even though Google's services are largely unavailable in China, the company is being targeted as part of a response to US tariffs.