19 aydýr süren soruþturmasý kapsamýnda bir ilke de imza atýldý.

In the background of the 19 months old investigation a principle was undersigned??

Who´s got a better translation for the sentence above? Don´t understand the meaning of the last part.

ilk:initiative,beginning

bir ilke de imza atýldý

bir ilke - an application (a principle, a fundamental) 

de - also

imza atýlmak - .... to be signed

my guess: an application also was to be signed

this is like a phrase.

" ilk" is first time. "ilke imza atmak" is "to make something for the first time."

I would translate the whole sentence as:

"Within his investigation that took 19 months, there was something that is made for the first time."