A 16-year-old Concord High School student is now in jail facing harassment and criminal gang recruitment charges.
Police arrested Markell Rugg Thursday afternoon.
The investigation started when a threatening note was found in a boy's bathroom.
Concord's Superintendent Wayne Stubb would not comment on Rugg's arrest, but said the district's student handbook has a strict policy against any gang involvement and prohibits all gang-related behavior.
The handbook states the corporation will vigorously discipline any student who conducts gang-related activities on any school property or at any school function or activity.
"I'm honestly very surprised that something like that would happen here at Concord," said Kaitlyn Radford, a senior at Concord.
WSBT asked Radford if she was aware of any gangs at school.
"It's not something that's prominent. If it [gang activity] is here, it goes on unnoticed," Radford stressed.
Elkhart County Police say this is the third school related threat they've investigated this week. On Monday, a threatening letter was found in a bathroom at Concord. The letter stated there would be a school shooting on Tuesday. In response, police added extra security and searched the school building, lockers, students and staff.