Nineteen people were hospitalized early Sunday after an intentional chlorine leak at the Hyatt Regency O'Hare during the 2014 Midwest FurFest, public safety officials said. The leak, reported about 12:45 a.m. Sunday, caused a complete evacuation of the hotel at 9300 W. Bryn Mawr Avenue. The hotel was hosting the Midwest FurFest convention. Attendees dress up like furry animals and celebrate art, literature and performance based on anthropomorphic animals, according to the convention's website.