KINGMAN, Ariz. (AP) — Police are investigating whether any students at a Kingman high school intentionally started a rumor about a planned shooting.

Additional officers were stationed Wednesday at Kingman Academy of Learning High School after numerous parents called the day before about a mass shooting threat.

Authorities believe the discovery Tuesday of a bullet accidentally dropped by a Kingman student caused a wave of hysteria across social media.

A school resource officer interviewed the student and his parents, who confirmed the family had gone shooting over the weekend.

Officials determi...