On Aug. 17, 2017, Spain suffers two terrorist attacks perpetrated by young people integrated into Spanish society. How could something like this happen?On Aug. 17, 2017, Spain suffers two terrorist attacks perpetrated by young people integrated into Spanish society. How could something like this happen?On Aug. 17, 2017, Spain suffers two terrorist attacks perpetrated by young people integrated into Spanish society. How could something like this happen?