Per a recent question here, an EU citizen may only cast one vote in the EU elections, even if citizen of multiple EU countries.
I imagine however that unlike national elections, this kind of multiple-voting might not be so easy to check, since the EU itself doesn't organize the EU elections, but leaves them to member states.
So, have there been cases reported in the press where people have voted (or tried to vote) multiple times in EU elections, once per country? How were or how would such cases be detected?
N.B. I realize the EU elections don't garner that much interest from voters, so the incentive to do this kind of cheating might be pretty low to begin with.