Just because a series of attacks scares people doesn't make it terrorism. I'm not saying he isn't a terrorist, but they haven't said anything about a motive yet, and the right motive would make it terrorism
Why do you dismiss the dictionary definition of terrorism in which a political motive is not required?
noun 1. the use of violence and threats to intimidate or coerce, especially for political purposes. 2. the state of fear and submission produced by terrorism or terrorization. 3. a terroristic method of governing or of resisting a government.