A technical analysis pattern for stock traders has pointed to an impending crash in stocks, adding to an increasing chorus of voices that have turned bearish on equities for the second half of the year.
The "Hindenburg Omen" - named after the Hindenburg disaster of 1937, in which the Zeppelin airship Hindenburg crashed and burned - is once again hovering over markets, according to Ron William, founder and principal market strategist at RW Market Advisory.
"The S&P 500 has hit an all-time high not so long ago, yet a lot of the stocks within the S&P 500 are actually making their yearly lows, suggesting some internal weakness in the stock market," he told CNBC Friday.
"[It's] maybe a good time to take profits within the market if indeed you see more downside risk coming up."