Investigators uncovered a mysterious note at the home of suspected Maine mass shooter Robert Card — as the US Coast Guard joins the massive manhunt for the fugitive. The discovery was made as authorities executed a search warrant at Card’s disheveled house in Bowdoin Thursday, according to NBC News — one day after police said the unhinged US Army Reservist killed 18 people and wounded 13 others in two mass shootings in Lewiston. Investigators are trying to determine if the note, the contents of which were not revealed, provides any answers to the motive behind the Wednesday night bloodbath, the...