PAPILLION, Neb. (AP) — Authorities say a suburban Omaha student is suspected of posting tweets that threatened a bombing and other violence at a high school.

Papillion-La Vista district spokeswoman Annette Eyman (EYE’-muhn) says the student has been arrested and the threats that were tweeted on Sunday have been discounted as unsubstantiated. Papillion-La Vista South High School was searched, but no bombs were found. On Monday district officials alerted parents and students about the threats and extra officers were present. Some students left the school early.

Eyman says the unnamed boy is a student at the school. The Twitter account has been suspended.