Wall Street ended lower as trade war tensions reignited investor anxiety. The S&P 500 fell 0.8%, snapping a three-day winning streak. Technology shares led declines, with Nasdaq dropping 1.2%. Renewed concerns about US-China economic friction triggered selling pressure across sectors.

The sell-off accelerated after reports suggested Washington might escalate tariff measures against Chinese imports. Investors rotated toward defensive assets, sending Treasury yields lower. Energy stocks also retreated as oil prices dipped amid global growth concerns.

Market participants are now watching for signals from Federal Reserve officials this week. Traders expect comments on monetary policy to influence near-term sentiment. Corporate earnings reports will also shape investor positioning ahead of the fourth quarter.