Milton police are investigating the theft of an advertising balloon. Chief Dan Layber says the 24-foot tall, 12-foot wide, advertising balloon was stolen from outside the new Parker YMCA grounds, on Parkview Drive, sometime Friday night. The balloon had "Grand Opening" affixed to the top of the balloon which is yellow, red, blue, orange, and green in color. An electric motor and light are also missing. The balloon is valued at $6000.