According to Idaho State Police spokesman Aaron Snell, Dylan and Bethany were both at home when the attack occurred but amazingly escaped.
Aaron Snell also said that the two survivors are currently assisting police with their investigation, but he would not reveal how they survived or whether Dylan or Bethany phoned 911 later that morning.
He went on to say that Dylan Mortensen and Bethany Funke are not suspects, but that the investigation team, which now includes investigators from the Idaho State Police, the FBI, and the Moscow Police Department, is looking into every option.
Dylan Mortensen and Bethany Funke: Both Have Privatized Instagram Accounts
According to dailymail.co.uk, Dylan, who is from Boise, Idaho and Bethany, a member of sorority Phi Beta Phi, have both locked their social media profiles.
However, both kids feature frequently on Madison and Kaylee’s accounts, including a touching Instagram image posted by Madison on August 16 that shows all five girls posing cheerfully on the back porch of the home where three of them died on Sunday.
The two daughters also appear in images taken by Kaylee hours before she died which she captioned: ‘One lucky girl to be surrounded by wonderful ppl every day’.
Another series of images of Dylan and Kaylee together, this time dressed up for a night out, was uploaded last Friday night.
Madison tweeted a similar set of photos the same day, showing her enthusiastically posing with both Bethany and Dylan.
The quintet, along with Xana, looked to have had a hectic social life that included nights out in Moscow and parties at their off-campus residence.
Xana Kernodle and Ethan Chapin, both 20, and best friends Madison Mogen and Kaylee Goncalves, both 21, were killed in the early hours of Sunday morning.