The U.S. and China raised tariffs on one another Friday, exchanging salvos in the growing trade war between the world’s two largest economies.

After the close of U.S. markets, President Trump said he would raise the rate of existing and planned tariffs on Chinese imports by 5 percentage points.

The rate on tariffs set to hit on Sept. 1 and Dec. 15 will be raised to 15% from 10%, while existing punitive tariffs on about $250 billion in Chinese goods will be raised to 30% from 25% on Oct. 1.

Earlier Friday, Beijing said it would impose tariffs of 5% and 10% on almost all the remaining U.S. imports on which it has yet to impose punitive taxes. China also plans to raise tariffs on many items already subject to duties, as the country increasingly struggles to match the U.S. levies.

China’s retaliatory measures, imposed on a total of about $75 billion of U.S. goods, are set to go into effect on Sept. 1 and Dec. 15, the same dates that the two new rounds of U.S. tariffs on Chinese goods are to take effect. Items China plans to impose or raise tariffs on include agricultural products, automobiles, apparel, chemicals and textiles.