im sorry to say that, but if somebody gives another one the opportunity to steal it.. its your fault.
how can this be happen... you cant lock it somewhere or leave it alone even when you just get something to drink or so...
NEVER LEAVE YOUR BMX ALONE
tell us how / when you reconize that it was stolen
of course it sucks so badly (my first bmx was stolen,too from locked cellar room) after half year we found that guy... and yea my brother beat him
hopefully you get some kind of success !!!