Beijing (CNN Business) Chinese companies have halted purchases of US agricultural products, marking the latest escalation of the trade war between the United States and China.

The halt in purchases comes in response to the Trump administration's announcement of new tariffs on Chinese imports last week, China's Commerce Ministry said Tuesday morning. The new 10% tariffs on $300 billion worth of Chinese imports are set to take effect on September 1.

China's Commerce Ministry called the new tariffs a "serious violation of the consensus reached by the two countries' leaders in Osaka." At the June G20 meeting in Osaka , American and Chinese officials had agreed to a cease-fire in the trade war.

State media had earlier quoted officials as saying Chinese companies had ordered US agricultural products after the Osaka summit, but some deals fell through due to "competitive pricing."

China's State Council Customs Tariff Commission also "will no longer rule out levying import duties on US agricultural products purchased after August 3," according to the Commerce Ministry statement.