FRESNO, Calif.—Internet social network rumors of plans to shoot up a Central California school have led to the arrest of a teenager who brought a handgun and ammunition to school.

The Fresno Bee ( http://bit.ly/Yth3vy) says the 14-year-old boy, a ninth grader, was arrested in a classroom Thursday afternoon at Central High School.

The teen had a .25-caliber handgun and more than 50 rounds of ammunition.

Fresno County sheriff's investigators and the school district superintendent say rumors began circulating Wednesday on Facebook that someone planned a shooting on the Fresno campus.

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Information from: The Fresno Bee, http://www.fresnobee.com