Sierra Vista police say a search of Buena High School turned up nothing after a bomb threat Wednesday morning caused the school to be evacuation and classes canceled.
The evacuation forced the school district to bus students to another facility that was designated as a reunification site where parents could go to pick up students.
Police Cpl. Tim Wachtel says the school was turned back over to school officials by noon and that police continued their investigation into the incident.
Buena has an enrollment of 2,600 students but it's not immediately clear how many were at school Wednesday. Tuesday was day of classes for seniors. Graduation is scheduled for Thursday evening.
District spokeswoman Eva Dickerson says the school will reopen Thursday.
The incident occurred a day after seniors' last day of classes and one day before Buena's graduation Thursday evening.
Sierra Vista is 62 miles southeast of Tucson.
