An explosion outside a Starbucks on the Upper East Side of Manhattan sent frightened people running into the street early Monday. The explosion blew out the windows of a Starbucks coffeehouse at East 92nd Street and Third Avenue at 3:25 a.m., according to New York City Police Commissioner Ray Kelly. A “low-order improvised explosive device” exploded after being left on a wooden bench in front of the coffeehouse, Kelly said