Officers investigate the deaths of four University of Idaho students at an apartment complex south of campus Monday.
The slain students were identified Monday as Ethan Chapin, 20; Madison Mogen, 21; Xana Kernodle, 20; and Kaylee Goncalves, 21.
In a memo to students, university President Scott Green said he and his wife were "heartbroken."
Kernodle, of Post Falls, Idaho, was a junior and a member of the Pi Beta Phi sorority majoring in marketing.
And Goncalves, of Rathdrum, Idaho, was a senior and a member of the Alpha Phi sorority majoring in general studies.