A day earlier, the US Justice Department unveiled a criminal complaint against Ukrainian national Artem Vaulin, 30, who was arrested in Poland and is wanted by American authorities for copyright infringement, money laundering and other charges.
Vaulin is alleged to own Kickass Torrents or KAT, which in recent years has eclipsed Pirate Bay and others to become the world's biggest source of pirated media.
The US criminal complaint said the website offers "a sophisticated and user-friendly environment in which its users are able to search for and locate content" which is protected by copyright.
KAT -- which distributes pirated films, video games, television programmes and music -- is estimated to be the 69th most frequently visited website on the internet, according to a Justice Department statement.
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"His arrest in Poland, however, demonstrates again that cybercriminals can run, but they cannot hide from justice."
Polish border guard spokeswoman Agnieszka Golias told AFP today that Vaulin was arrested at Warsaw's Chopin airport on yesterday "during an attempt to enter Poland".
US officials are seeking to extradite Vaulin on charges filed in a federal court in Chicago, which ordered the seizure of one bank account and seven domain names associated with the file-sharing website.