Exchange traded funds that invest in high-yield or “junk” bonds plunged nearly 2% on Thursday even though the underlying market was relatively quiet, according to reports.

The ETFs’ decline is another worrying sign for stock bulls, since weakness in the high-yield sector can foreshadow tough times for equities.

SPDR Barclays Capital High Yield Bond (NYSEArca: JNK) and iShares iBoxx $ High Yield Corporate Bond Fund (NYSEArca: HYG) both slipped about 2% on Thursday.

Trading volume in the junk ETFs surged on Thursday. [High-Yield ETF Pullback a Worrying Sign for Market?]

Barron’s noted that the high-yield ETFs fell sharply while the market for the underlying market was little changed.

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