China’s foreign ministry says retaliatory tariffs on U.S. goods “took effect immediately” after Washington raised import duties on billions of dollars of Chinese goods.

A foreign ministry spokesman, Hu Chunhua, on Friday gave no details of the increase. But Beijing previously issued a $34 billion list of American goods including soybeans and electric cars it said would be subject to 25 percent tariffs.

Hu said, “After the United States imposed unfair tariffs on Chinese goods, our tariffs on part of the U.S. products also took effect immediately.”