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And it is when you do mail screening these are some of the signs that you look for when you take -- in the package. >> sandra: what does the investigation look like, would you be able to give us an idea whats happening at this moment as we learn and to report again cnn studios in new york city evacuated, time warner center has been evacuated, two explosive devices found, one at the home of the former president barack obama in washington and one at the home in chappaqua of bill and hillary clinto...