UPDATE via Associated Press, 9/10/13, 2:25pm:
Police in central Missouri say a teenager shot and killed himself as he was being taken into custody for allegedly sending a text threatening school violence.
The shooting happened around 2 a.m. Tuesday near Ashland. The name of the 17-year-old student has not been released.
Boone County Maj. Tom Reddin says the teen sent a text to another student Monday night saying something dramatic was going to happen at school Tuesday, something that would include loss of life.
The family of the teen who received the text contacted police. Reddin says that as officers went to take in the teen who sent the message, he asked to get dressed.
Reddin says that's when the teen went into the home, retrieved a handgun and shot himself in the chest.
ORIGINAL STORY - 9/10/13, 12:00pm: Ashland Police and the Boone County Sheriff's Department located the student believed to have sent a threatening text message regarding Southern Boone County Schools.
Before they could take him into custody at his home, the 17-year-old student shot and killed himself.
Police received a report of a credible threat against Southern Boone County High School around 10:30 Monday night. Southern Boone County School District officials cancelled all classes for today as a precaution while searches were being conducted. No devices of a threatening nature were discovered.
Classes will resume tomorrow at Southern Boone County Schools and grief counselors will be available to students and staff.
Ashland Police and the Boone County Sheriff's Department are holding a press conference today and we will provide more details as soon as they become available.