Furthermore, new witnesses were questioned on Thursday. This process may go on for a few more days since, based on statements of earlier witnesses, other names of possible witnesses came up. Besides that, a vast amount of video-footage has to be studied for all relevant details. Police retrieved camera footage from over 10 locations. This all has to be studied which is time consuming.
The prosecution is preparing official requests for assistance to be sent to the US authorities. Especially information on the background of the victims and from people close to the victims which could be relevant for the investigation. This is where the help of the FBI could come in and would make these investigations go faster and smoother.
Press Release from Public Prosecutor's Office