Washington, D.C. ? More than 3 percent of 17 million crimes reported from 2000 through 2004 occurred at schools, colleges and universities, with knives being the most commonly used weapon, according to an FBI study released Thursday.

The Crime in Schools and Colleges study, which gathered data from about a third of the nation’s law enforcement agencies, showed that the most commonly used weapon in more than 558,000 campus-related crimes over the five-year span was a knife – not counting fists and feet, which accounted for most of the incidents.

Almost 11,000 incidents included a blade, and more than 3,400 included a firearm.