They are saying that somebody belonging to their group commited the attack. And of course there are reprecussions. Its called a predator missle up the ass when little snackbar takes a break from goat fucking and sticks his head outside that cave. He heers a faint wistle getting louder but by the time he realises wtf is going on BOOM. Its just very hard to track down and punish those responsible.
It’s kind of simple. There’s an attack, let’s say the Nice Attack not too long ago. Then the group I**S says “oh we did it haha.” They’re terrorist, they terrorize people. One of these days you’ll see them wiped out. Can’t wait.