your comment supports what this "investigation" looks like... you pick someone (you wish) to be accused/guilty, and then try to proof this. thats not police work. imho: at the end of the day we will see, it was exactly this approach what doomed your "investigation" from day 1.
Aden hotel used by Yemen goverment hit by grenade (Reuters)
from the article: Hamas: Jordan or Egypt likely behind Dubai hit