ANCHORAGE - The FBI released new details of how Israel Keyes kidnapped and killed 18-year-old Samantha Koenig.

We have to warn you: This information is graphic and disturbing

We now know Koenig was sexually assaulted and asphyxiated by Israel Keyes within hours of her abduction on February 1.

The FBI has released a detailed account of that night, and Anchorage police have released security video footage from the Common Grounds coffee stand on Tudor, where she worked, and from the Home Depot parking lot, where his truck was parked and where he took her by gunpoint.

Now here's where federal authorities and Anchorage police differ on why Keyes picked that coffee stand. APD is not yet saying whether the murder was planned or was an escalation of the robbery of the coffee stand.

But the FBI's account is that Keyes picked Common Grounds because it was open later than other stands and because the snow berm from the record snowfall we had last year was so high and blocked visibility.

The FBI also said Keyes had never seen Samantha before he approached the kiosk that night. Wearing a ski mask, he asked for coffee, and then once he got it, pointed a gun at her and demanded money.

He had her turn off the internal and external lights, then came in and zip-tied her hands behind her back. It all only took 12 minutes.

According to the FBI, Samantha tried to get away.

According to the confession Keyes gave, Samantha tried to run away and he tackled her, and then threatened to shoot her if she tried it again.

The FBI told KTVA he tackled her, making it look like he was drunk and stumbling, and ordered her, at gunpoint, to do the same.

He put her in his truck, seat-belted her and zip-tied her to the seat belt.

Keyes talked to her as little as he could, but said it was just a kidnapping for ransom and convinced her she would be released unharmed if it was paid.

Anchorage police said someone was supposed to pick Samantha up that night.

The FBI said a man showed up to get her just 21 minutes after the abduction. They said the same man missed Keyes by four minutes at the espresso stand two hours later.

Keyes had returned to get her cell phone and the edges of zip-ties he left behind.

The cell phone was important to Keyes.

Keyes sent text messages to Samantha’s boyfriend and to the owner of Common Grounds, attempting to make it appear she had had a bad day and was leaving town for the weekend.

He asked her for her debit card, and she told him it was in the truck she shared with her boyfriend. He also asked where her house was and for the PIN number.