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.

The World Trade Organization said China submitted a request for consultations with the U.S. on the tariffs. China said the duties are discriminatory.

China's finance ministry said it would impose levies of 15% for U.S. coal and 10% for crude oil, farm equipment and some cars.