No weapons have been located thus far, police said, but based on preliminary information, "investigators believe that an edged weapon such as a knife was used," Moscow Police Captain Anthony Dahlinger said in a statement.The university said Chapin was a freshman and a member of the Sigma Chi fraternity, and Kernodle was a junior majoring in marketing and a member of the Pi Beta Phi sorority.Mogen was a senior also majoring in marketing and a member of Pi Beta Phi, and Goncalves was a senior majoring in general studies and a member of the Alpha Phi sorority, the university said.So many students had left the scenic tree-lined campus in Moscow, Idaho, by Tuesday that university officials said a candlelight vigil scheduled for the next day would instead be held after the Thanksgiving break.In a memo released Monday afternoon, University of Idaho President Scott Green urged university employees to be empathetic and flexible and work with students who decided to leave classes to spend time with their families."