EDIT: here is a story on it
http://mashable.com/2013/01/28/eve-online-asakai/
"Gamers were agog this weekend when screenshots and videos of an enormous (and somewhat accidental) battle in EVE Online hit the web. All told,
3,161 players duked it out in the Asakai system; 222 ships were killed, resulting in a loss of 470 billion ISK (the in-game currency), according to EVE-Kill.net."
the other source i read said more assets were lost, either way thats some mass pvp