Timeline: Workplace Shootings in U.S. Over Past 5 Years

On Feb. 25, 15 people at a Kansas factory were shot, three of them killed, by a co-worker whom police say had also shot two other people as he drove toward the facility. The shooting at Excel Industries in Hesston, Kansas, was at least the fourth workplace shooting in the United States in the past 12 months alone.

Here are some questions and answers about workplace shootings:

WHAT OTHER WORKPLACE SHOOTINGS HAVE TAKEN PLACE IN THE PAST 12 MONTHS?

WHAT WAS ONE OF THE EARLIEST WORKPLACE SHOOTINGS?

WHAT OTHER WORKPLACE SHOOTINGS HAVE OCCURRED OVER THE PAST 5 YEARS?

Associated Press News Researcher Jennifer Farrar contributed to this report.