Authorities said a 16-year-old Chandler high school student will not face charges after allegedly making a "Columbine-type" threat, and planting "dummy" explosive devices at the school and at his home.
"Detectives are working with the Maricopa County Attorney's Office and at this time a decision to not file charges has been made," said Joe Favazzo, spokesman for the Chandler Police Department, in an email.
Favazzo did not elaborate as to why charges will not be filed. He also said the 16-year-old had been released to his parents.
Students at Chief Hill Academy and a nearby apartment complex were evacuated Tuesday morning after a student showed a threatening text message to the school's principal at 10:30 a.m. allegedly sent by the unidentified 16-year-old.
Police said the text message indicated the student planned to conduct a "Columbine-type" incident against the school located near Frye and Cooper roads and indicated it would happen at 11:25 a.m.
The teen's ex-girlfriend, Sara Allen, tells ABC15 she's the one who informed school officials before he could act out his sinister plans.
Chandler police and the Mesa Bomb Squad evacuated and searched the school finding two "dummy" devices, one outside and one inside, intended to look like explosives.
ATF searched the teenager's home near McQueen and Ray roads finding a third "dummy" device, according to Chandler police. The suspect was found at his home and was taken into police custody.
The neighborhood where the teenager lived was partially evacuated while authorities searched the home to determine that the device was fake.
Authorities released control of the school back to school officials around 2:45 p.m., according to Chandler police.
School officials said they have been communicating directly with students and their parents, and are expecting to send a letter home on Wednesday.
Students were evacuated to a church parking lot south of Chief Hill Academy where parents were able to pick them up. Authorities said the alternative school has over 200 students in grades 7-12.