In the U.S., Ohio National Guard troops, who had been sent to Kent State University after disturbances in the city of Kent the weekend before, open fire on a group of unarmed students, killing four and wounding nine. Some of the students had been protesting the United States’ invasion of Cambodia, but others had been walking nearby or observing from a distance. The incident triggered a mass protest of four million college students nationwide, and eight of the guardsmen were indicted by a grand jury, but charges against all of them were eventually dismissed.