I can't keep up with all the claims now, but didn't the NYT claim the police said they were turned away when they arrived at the ranch? I could have sworn I read this somewhere.
Par. 2 of the report proves that claim wrong.
I don't recall the specifics, yet I understand Secret Service called the proper authorities - possibly the local sheriff. A different law enforcement agency may have heard radio chatter and drove out to the ranch. The gate keepers at the ranch hadn't even heard about the shooting yet and turned them away.