KANSAS CITY, Mo. - Tall buildings and outdoor cafes are tempting targets for terrorists.

So may be the hamburger in your bun - or the bun itself.

America's food supply is vulnerable to attacks that might not be as dramatic as a bomb but could have explosive consequences for the economy and public confidence, scientists and law enforcement officials agree.

Many of them will convene this week in Kansas City, Mo., for the first international symposium on "agroterrorism." They will talk about how easily diseases can be used as weapons against crops or livestock and how best to prevent an outbreak.

Representatives from Russia, Australia, Canada, Mexico and Israel are expected to make presentations at the symposium. FBI Director Robert Mueller and David Franz, chief biological scientist for Kansas City-based Midwest Research Institute, also will speak.