Well, because as he said, they so far confirm to have found explosive residue at one site, and not the other. And, as stated, there was suspicious activity of a

Well, because as he said, they so far confirm to have found explosive residue at one site, and not the other. And, as stated, there was suspicious activity of a ship directly over the site for a week prior to the attack, where explosive residues have been confirmed, and not over the other site.