CHARLESTON, S.C., April 21 (UPI) -- Increased security was in place at a South Carolina high school Monday because police uncovered a student's alleged plot to set off bombs, investigators said.
Senior Ryan Schallenberger, 18, of Chesterfield, was taken into custody after his parents called authorities when 10 pounds of ammonium nitrate was delivered to their home, WCSC-TV in Charleston reported.
Scallenberger was charged with making a bomb threat.
The student's arrest came on the ninth anniversary Saturday of the massacre at Columbine High School in Colorado.
Police said the Chesterfield High School student had gathered enough supplies to make several bombs capable of killing dozens of people, depending on where the explosive devices were planted.
Authorities found a journal with detailed maps of the school, Chesterfield Police Chief Randal Lear said.
Chesterfield is located near the border between North and South Carolina.
