In the last trading session, Wall Street tumbled as major indexes retreated due to warnings from artificial intelligence leaders regarding rapid industry growth and a spike in oil prices. Among the top ETFs, SPY slipped 0.4%, DIA inched down 0.2% and QQQ dropped 0.6% on the day.

Two specialized ETFs are worth noting, as both saw trading volume well above normal levels. Both these funds experienced volume levels that were double their average for the most recent trading session. This makes these ETFs worthy of watching out in the coming sessions to see if this heightened investor interest persists.

(EMLP Quick QuoteEMLP - Free Report) : Volume 2.17 Times Average

This Energy Infrastructure ETF was under the microscope as about 0.51 million shares moved hands. This compares with an average trading volume of roughly 0.23 million shares. Meanwhile, EMLP slipped about 0.7% in the last trading session and moved down 2% in a month.

(SCO Quick QuoteSCO - Free Report) : Volume 1.75 Times Average

This Crude Oil ETF was in the spotlight as around 7.80 million shares moved hands compared with an average of 4.75 million shares a day. We also saw some price movement as SCO slipped 0.7% in the last session. SCO has lost 17% over the past month.