Once Judy and Nick were able to get ahold of the FBI (Federal Bureau of Investigation), they informed them: one, their names; two, the location of their headquarters; three, they need to speak with the Behavioral Analysis Unit (BAU for short) because they were almost killed by a maniac who killed another cop; and four, the killer might've targeted other cops, as well as Judy and Nick.
The FBI transferred them to the BAU without questioning how they got ahold of the FBI if they don't live in the USA, and the BAU answered the call.
"This is Aaron Hotchner, who is this?" said the person on the phone.
"This is Judy Hopps, I'm going to put you on speaker," said Judy. "If you're in a group, can you do the same?"
"Sure."
"Ok, I am a rabbit police officer, and me and my fox partner, Nick Wilde, were patrolling Downtown Zootopia, when we found a trail of blood, which we followed. We tracked it down to an alleyway, where we saw the head of a rhino cop, separated from his body, which we also found. Suddenly, a maniac came out of nowhere, who was about to kill us! We escaped the alleyway, but not before the maniac sliced off a section of Nick's tail. We rushed to our police car, got in it, and left before the maniac could hijack it. Now I think that maniac has targeted other police officers, and I think that both of us are next."
"Alright, thanks for the information, Judy," said Hotchner. "We'll get right to it."
"Your welcome," said Judy, "And thank you for taking the case. Let us know once you get to Zootopia so we can see each other in person."
"Will do," said Hotchner.
Back at the BAU headquarters, Hotchner hung up the phone when he and Judy were done talking, and said, "We have another case to crack."