Authorities in Kentucky say a man was arrested for plotting a school attack, and a New Jersey woman is being credited with tipping off police.

They say they received a tip from a woman who said 20-year-old Dylan Jarrell had been harassing her on Facebook.

Jarrell was stopped by police a block away from a high school, where officers say they found a firearm, ammunition, a bullet-proof vest and a 100-round magazine.

Jarrell has been charged with making terroristic threats.

Police say they are convinced the woman's tip saved lives.