New Delhi, May 30 -- Wall Street's main indexes fell on Friday as U.S. President Donald Trump accused China of violating a tariff agreement, ramping up tensions in a trade war that has roiled global markets and businesses.

Trump's post on his Truth Social platform did not specify how China had violated the agreement made in Geneva, Switzerland, and what action he would take against Beijing. "So much for being Mr. NICE GUY!," he said.

In their Geneva talks, both sides had agreed the U.S. would drop levies on Chinese imports from 145% to 30% during a 90-day negotiation period and China would cut duties from 125% to 10%.

"We went from a place where it felt as though investors had a pretty good handle on the direction of trade and tariffs ...