An anti-illegal immigration rally featuring Kris Kovac, who participated in formulating the Arizona anti-illegal immigration law, and Joe Arpaio, the tough Maricopa county sheriff, was disrupted today by telephoned bomb threats and discovery of a package with unknown contents. The rally, which had been moved once because of concerns by an Overland Park College, continued after police notified those attending of the threat. Overland Park Kansas police bomb units are attempting to determine if the package that was found actually contains explosives.