Rushab Momaya, 23, stated that he was going to bomb the school but did not include any details in the posting, police said.
On Wednesday, detectives developed probable cause to arrest a juvenile student for "terroristic threats", a violation of Wyoming statutes.
Jackson Police have arrested a suspect in connection with a bomb threat to the Jackson Hole Middle School on March 13. The sheriff assured them "we are putting a lot of resources toward finding who did this and holding them accountable", but he said parents can help, "by talking to their children, and if their children know something, they need to let us know because someone could get hurt - and of course, it's impacting students, parents and teachers".
Many students in Douglas Area Schools were left shaken after a bomb threat Tuesday at both Douglas High School at the Pizza Hut in Box Elder.
After hours of searching all buildings and outbuildings in the district, it appears that law enforcement no longer believe there is a threat.
After a thorough search, no further information or evidence was discovered that would support the threat as being credible.More news: FIRST ALERT WEATHER DAY: Severe thunderstorm watch issued for most of Lowcountry
More news: 'Jayalalithaa refused to go to hospital', claims Sasikala
The sheriff's office is now conducting a sweep of the school and said it could take hours.
Law enforcement has cleared the scene, Home Depot has reopened and the employees are back at work.
Police and fire officials also worked closely with the Board of Education and school security personnel to ensure that the safety and security of Trumbull High School had not been breached during this incident.
Security camera footage helped police in the investigation, Lewis said, and the boy later admitted writing the threat.
Oklahoma County jail records show Richard Paul Holt of Marlow was booked Tuesday on complaints of making a bomb threat and drug possession.