Renewed jitters over China-US trade tensions pull Wall Street lower in premarket trading

U.S. markets slumped early Tuesday after Chinese sanctions against the U.S. subsidiaries of a major South Korean shipbuilder shook a fragile sense of calm over trade tensions with Washington.

Futures for the S&P 500 lost 1% before the opening bell, while futures for the Dow Jones Industrial Average slid 0.6%. Nasdaq futures tumbled 1.3% as a broad of swath of technology companies saw their shares slide.