DU bites on every Hoax Hate Crime and posting the exposure of a hoax is tantamount to calling for pizza delivery.
Right now (and for many years past), the demand "hate crimes" exceeds supply, and hoaxers are taking advantage of that unsatisfied demand. My guess is that at least 5 of these bomb threats are from race-baiting hoaxers, and very possibly all 7 are from race-baiting hoaxers.