In the last trading session, U.S. stocks were in the red due to weak earnings and guidance that aggravated fears of a slowdown. Among the top ETFs, investors saw (SPY Quick QuoteSPY - Free Report) lost 0.7%, (DIA Quick QuoteDIA - Free Report) shed 0.9% and (QQQ Quick QuoteQQQ - Free Report) move lower 1.2% on the day.

Two more specialized ETFs are worth noting as both saw trading volume that was far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most recent trading session. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra-interest continues.

(FRI Quick QuoteFRI - Free Report) : Volume 5.56 Times Average

This real estate ETF was under the microscope as 338,000 shares moved hands. This compares with average trading volume of roughly 61,000 shares and came as FRI gained 1.2% in the trading session.

The big move was largely the result of heightened volatility and uncertainty that can have a big impact on real estate stocks like the ones we find in this ETF portfolio. This is because REITs offer solid dividend payouts and excellent capital appreciation even in a turbulent market. FRI has gained 10.2% over the past month and carries a Zacks ETF Rank #3 (Hold) with a Medium risk outlook.

(SGOL Quick QuoteSGOL - Free Report) : Volume 2.96 Times Average

This gold ETF was in the spotlight as around 134,000 shares moved hands compared with average 45,000 shares a day. We also saw some price movement as SGOL added 0.3% in the last session.

The movement can largely be blamed on hopes that the Fed will keep interest rates unchanged during its two-day policy meeting slated to start today. SGOL has gained 8.6% in a month’s time and carries a Zacks ETF Rank #3 with a Medium risk outlook.

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