This was double sourced before The Oklahoman reported the story. They are not running with speculation but are having a hard time getting people to go on the record. The quotes are accurate and he is not the only one that has the same information. Local authorities do as well but FBI is in charge.
If the incident is double sourced the story should say so (or did I miss it somewhere). I wouldn't have been so skeptical. I was a newspaper and wire service reporter for 15 years, so when I see stuff like this alarm bells go off.