Director Guy Costa says workers found only two signs in the storage area Friday, meaning someone stole 11 others.
Five banners were stolen from the parade route, and the city offered the other 45 to the public for $150 each to cover the additional cost of hanging and taking down the signs. Fans quickly bought the banners and had picked up all but 13 by Thursday.
Costa told the Pittsburgh Post-Gazette that police are investigating and the city will replace the stolen banners, if necessary.
Copyright 2009 by The Associated Press