secrecy between the weapon and the vehicle and the actual attack, which means there was planning involved. so if there was in fact planning involved, that brings us a lot closer to terrorism, we want to be able to carry out this attack, and have no traceability to the actual perpetrators of the attack. >> they do have a suspect who's been arrested. does that mean this investigation should move forward at least faster than what we've seen in the past? >> having someone in custody means you can investigate, interrogate, you can -- you can physically extract information out of him to be able to start to trace back where the attacks stemmed from the fact that they have someone who's incredibly helpful. we'll see what's gleaned from the interviews in the next coming days. >> if you look at this, and the german officials are being cautious here. they're not calling it an attack at this stage. it looks like an attack.