I guess that's too many genres for one movie, but I think they're all accurate.
The story revolves around an apparent spree-killing in a tiny, destitute Arizona border town near Nogales, Mx.
The main suspect is also an amatuer photog and though not initially found, when a roll of film that he had taken during the entire night of the killings is developed, the story takes on a much darker tone.
I have a soft spot in my heart for low budget horror films, but this one really is pretty high quality. Only one or two of the actors couldn't pull off the doc/reality part (the sherriff being the most annoying of them).
There is a bit of a twist at the end, when one of the characters' book is published, and a "cover-up" is potentially revealed, but for the most part this fizzles at the end unfortunately.
Over all, it's really well done for the resources they had, and the photo vs video aspect of the found "footage" was unique and really something I hadn't seen before.
If you like "The Bay" but weren't really into the heavy-handedness and lack of "fright" you may just like this a lot.