Washington - There's new information in the investigation of last Friday's pipe bomb explosion in Northwest Washington parking garage. The brother of the man injured in last Friday's pipe bomb explosion has been added to a National Law Enforcement database, so police across the country will know he's a missing person. Prescott Sigmund, 34, hasn't been seen by his family since Monday. Police say Prescott Sigmund disappeared soon after they asked him to take a polygraph test. Police say he's not a suspect, but they do want to question him. Sigmund's half brother, 21-year-old Wright Sigmund, remains in critical condition....