YORK, Neb. (AP) — Police in York say an 18-year-old high school senior is in jail on charges of making terroristic threats related to a bomb threat made against York High School last Monday.

The student was arrested Saturday morning at home.

The bomb threat was posted on the social media application Yik Yak. The threat prompted the school to ask for increased security which included officers from York police and the Nebraska State Patrol to be at the school. Students’ bags were searched as they entered school.

Police spokesman Michael Hanke says mobile electronic devices were seized from the student’s home using a search warrant police had obtained. Forensic investigators with the Nebraska State Patrol are checking the devices for evidence.