UPDATE 9 AM : HBO just issued a statement addressing the leak and the measures the network is taking. “Sadly, it seems the leaked four episodes of the upcoming season of Game of Thrones originated from within a group approved by HBO to receive them,” HBO said.  “We’re actively assessing how this breach occurred.”

PREVIOUS 7:30 AM: On the eve of the Season 5 premiere of HBO’s Game of Thrones tonight, the most pirated show in the world is suffering another leak. The first three and possibly four episodes from the fantasy drama’s upcoming 10-episode fifth season have surfaced on torrent sites in standard definition. According to TorrentFreak, the episodes were downloaded more than 100,000 within the first 3 hours.

It appears that the sources are screeners sent out by HBO but the network likely is still working on tracing the origin of the illegal upload. Ironically, the latest leak comes just as HBO is making GOT available to non-subscribers via HBO Now and Sling TV and is premiering the show simultaneously in 170 countries so fewer fans are tempted to go the piracy route.