It's unfortunate, the day and age in which we live, that we have to follow every single one of these threats.
The interviews are more along the lines to determine whether or not the threat is credible, ... We need to follow up with certain individuals in an effort to determine the credibility of the information.
At this point in time we don't have any evidence that suggests this threat is credible. However, we are continuing our investigation. We have to follow this to the end.