NEW : `` Each victim 's body showed obvious signs of trauma indicating that a homicide investigation is warranted , '' police said in a written statement . Denver police ask the FBI for help in their investigation . It seems the house was set on fire to hide the bodies inside , investigators say . ` ` Each victim 's body showed obvious signs of trauma , '' police say . Four women and one man were killed .
NEW : Denver police ask the FBI for help in their investigation . It seems the house was set on fire to hide the bodies inside , investigators say . ` ` Each victim 's body showed obvious signs of trauma , '' police say . Four women and one man were killed .