To summarize what was said during the press conference, and the prosecutorial logic: * The conclusion is essentially based on the information available at the

To summarize what was said during the press conference, and the prosecutorial logic: * The conclusion is essentially based on the information available at the time of the murder, and witness testimony from that time. The early investigation was a huge parade of mistakes, and no conclusive technical evidence could be obtained. The only substantial evidence the police has is two bullets, and they're so damaged that the Swedish forensics experts are not confident they could be matched to a weapon. * Engström, the suspect, is known to have been near the murder scene at the time, and he has been conclusively shown to have lied about his actions. Among other things, he claimed to have provided first aid to Olof Palme, and to have spoken to his wife, both of which are false. Engström has also changed his story or provided contradicting testimony on other things. The early assessment was that he enjoyed the attention and wanted to inflate his own importance. * The other witnesses generally describe a fleeing suspect whose description matches Engström's. He himself provided another description. None of the other witnesses remember Engström being at the scene in the minutes after the murder, contrary to his own statements. * Engström had shooting experience, and was good friends with a weapons collector who had a large amount of firearms, including the type used in the murder. * Attempts to find a forensic link failed, including in the recent months. The possible murder weapon owned by Engström's friend was inconclusive. DNA swabs from Engström's family could not be matched to anything. The police appear to have no DNA of the murderer from the crime scene. * While the above points would be enough to arrest Engström and likely to charge him, this would likely not be enough evidence at a trial. Most importantly, there's no hard evidence that Engström had a weapon on him that night. Interestingly, today even the PM who took over after Palme said that even he had noticed the police incompetence within hours of the murder.