In the last trading session, U.S. stocks ended on a stronger note as fears of a Brexit subsided as recent polls tilted toward Britain more willing to stay in the EU. Among the top ETFs, investors saw SPY go up 0.64%, DIA gain 0.73% and QQQ surge0.63% 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:

(EWU Quick QuoteEWU - Free Report) : Volume 5.33 times average

This U.K. ETF was under the microscope on the last trading day as nearly 21 million shares moved hands. This compares to an average trading volume of 3.9 million shares and came as EWU gained 4% in the session.

The big move can largely be attributed to June 23 drawing closer when Britain will vote on whether the UK should remain a member of the EU. This can have a big impact on U.K. stocks like the ones we find in this ETF portfolio. In the last one-month period, EWU was up about 2.2%. The fund currently has a Zacks ETF Rank #3 (Hold).

(DBP Quick QuoteDBP - Free Report) : Volume 4.84 times average

This precious metals ETF was in focus yesterday as almost 274,800 shares moved hands. This compares to an average trading day of 56,800 shares. DBP lost about 0.4% in the session.

The movement can largely be blamed on a flight to safe-harbor assets subsiding. DBP was up over 3.5% in the past one-month period. The fund currently has a Zacks ETF Rank #3.

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