You are correct in that it doesn't occur daily by any means. It is odd also that Drudge has nothing about it currently.
interesting.... such things must occur occasionally with despondent individuals with access to explosives..... but even that is not a case of someone taking the trouble to build a bomb and carrying it around with them.... the OK case seems much stranger unless it turns out to be a jihadist (which is strange and deranged in another way).