Authorities on Wednesday said the BCA would be working jointly with the FBI on the investigation. BCA agents went to the scene Wednesday believing they’d play a role.

But in a statement Thursday, the BCA said the FBI reversed course and that the federal agency would be the sole investigative unit.

That meant the BCA would no longer have access to the case materials, scene evidence or investigative interviews necessary to complete a thorough and independent investigation, the state agency said.