I am not sure how this constitutes a blooper or a hoax or anything else. It's a bundle of news reports within 24 hours of the shooting, while facts are still being collected and various newsmen are getting information or even misinformation from people who seem to know something.
After complicated horrific events like this, in which many witnesses are traumatized or highly suggestible or unwilling to talk, it may take weeks or even many months to sort out all the details correctly.
As a rule of thumb you get the most accurate information in the first 24 hours after an event - BEFORE the spin machine cranks up into high gear. That does not guarantee that every piece of reportage is accurate, but it is less likely to be outright "spin". Und vee all know vhat spin is - a euphemism for LIES.