Photos: 4 University of Idaho students found dead

Four University of Idaho students found dead in an off-campus home were targeted and the killer or killers used a knife or other "edged weapon," police disclosed Tuesday.

More than 150 people have been interviewed, but authorities gave no indication they were closer to naming a suspect. More than 45 investigators are involved in the murder case. Here's what we know, and don't know.

Investigators have yet to name a suspect in the stabbing deaths of four University of Idaho students who were found dead in a home near campus last month. But would-be armchair detectives and internet sleuths have come up with several of their own, the conclusions often based on conjecture and rumor.