Stocks are on a four-day decline, with the S&P 500 nearing a critical level, causing concern among buyers about market momentum. The S&P 500 opened down 0.6% at 6,630.11, with the Dow also down 1% and the Nasdaq Composite falling 0.9%. Technical analysis firm CappThesis is eyeing a target range of 6630 to 6650, with a potential drop to 6360, which would be an 8.2% decrease from the index’s previous high.

Read more at Dow Jones & Company: Stocks Are Sliding for Fourth Straight Session. Here’s the Level to Watch.