have been advised to not deliver or open any mail. what are your thoughts? >> the first step for authorities is to ensure there aren't any digsal additional packages and to not open anything. what you're going to see quickly is an examination of the remnants of the devices that exploded and see if there's anything tell tale that can come out of that examination once they've been able to secure the area and be highly confident there aren't any additional explosive devices nearby. step one is to secure the perimeter and ensure there are no other devices. step two is to identify what was behind this, what type much device and whether or not that can lead them in one direction in the investigation. >> roger, according to wbal tv, the two packages exploded in this mail room, the source said when the packages were opened in the mail rooms of the building, a small explosion happened.