[Keflavik76]

:: ERIC HOLDER LOOKS TO HAVE BEEN ON THE ILLEGAL MAR A LAGO RAID ::

Define “ON”, as used here.

I like the preposition:

1. paid for by:

   "the drinks are on me"

    

   But this might work better:

   —used as a function word to indicate involvement or participation

   on tour

   on the team

   on duty

[Cletus.D.Yokel]

So, “ON” = A part of.
Implied is “in on the planning of” but not physically present at MAL.