Exactly, which is what scares me about this attack.
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This type of attack WILL BE RESPONSIBLE for a major terror attack in the near future because of a few factors:
1) very low risk to the terrorists, unlike their usual MOs.
2) small, capable drones and their components are ubiquitous in many nations.
3) explosive devices can be small when matched with speed and precision.
4) a drone is a superb platform for CBR attacks.
5) once a drone attack is proven effective against a certain type of soft target, a stadium, an airport, a refinery.., all similar targets will be forced to respond.