China said it was opening an antitrust probe into Google, part of a series of actions Tuesday that also included tariffs on U.S. coal and liquefied natural gas imports as well as restrictions on the export of certain metals.

HONG KONG (AP) — 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.

China said Tuesday that it is investigating Google for potential antitrust violations after the Trump administration levied new tariffs on Beijing. The Chinese State Administration for Market Regulation announced in a press release that it is probing the tech giant over suspicions it violated the country’s anti-monopoly laws.