My understanding is that the current affidavits for the upcoming trial are sealed. This could mean a variety of things, one of them being that the authorities are aggressively trying to close in on other suspects. The police have always believed that others were involved despite the vociferous protestations from certain parties. I am hopeful that the truth will come out. No one deserves what happened to these people and it would be a travesty of justice if anyone involved in this crime gets away.