BOSTON - More than 10 blinking electronic devices planted at bridges and other spots in Boston threw a scare into the city Wednesday in what turned out to be a publicity campaign for a late-night cable cartoon. Most if not all of the devices depict a character giving the finger. Boston police said Wednesday night that one person had been arrested, and authorities scheduled a news conference to provide details. Highways, bridges and a section of the Charles River were shut down and bomb squads were sent in before authorities declared the devices were harmless. "It's a hoax — and...