Two calls came in, a day apart from each other, warning about a bomb at Anderson High School.
"The suspect didn't appear to be shocked at the time of the arrest," said AISD Police Chief, Eric Mendez.
He says 17-year-old Cody Dykstra is facing two charges of a false alarm or report.
"I don't know if he admitted it, but I just don't think he had any reaction at all...I think a non-reaction is kind of a giveaway too."
Two other threats, not connected to Dykstra, followed at Westlake High School and at Lake Travis ISD.
Mendez said, "It's an incident you don't want to see occur, so when you're talking about a school, even a threat, people are more forthcoming with information."
An anonymous tip helped lead investigators to the 17 year-old who lives in the area of Anderson High.
"Using video surveillance of the store that's on the same property as the pay phone where the call came from, we were able to identify, or we were able to locate suspects," said Mendez.
The tipster claimed Dykstra had been bragging about making the threats.
"If you call in a bomb threat, if you make a false report or a false alarm at any school campus it's a state jail felony. So those individuals, whether they're a juvenile or an adult, they face the same charge," said Mendez.
Campus police say Dykstra is not currently a student at Anderson High School.
"The community, citizens in general...are more aware of...what the threats are," said Mendez.
Threats usually create a drop in student attendance, which results in a loss of funding for schools
Mendez said, "People are more aware or more conscientious of school safety and ensuring that our students are safe every day."
Chief Mendez says real or fake, every threat is always taken seriously.