Always best to wait for the reasoning behind it. One could make the assumption this was islamic terrorism, but they need more information. If the man was mentally ill or an escapee from a mental asylum, then even if this was motivated by belief, their could be many more contributing factors involved. Wait for more info to come out.
Years ago when Jean Charles de Menezes was shot dead, the press accused him of being a suicide bomber, but it was later confirmed he wasn't. And while this current case the assailant was out to kill, you could make up anything about his motivations before the facts come out.
That said, if it was religiously motivated, the government will try to cover it up as not to 'offend anyone'.