(AP) — A former University of Nebraska at Kearney student has been given 18 months of probation for setting off a firecracker in a dormitory.

20-year-old Ann Castater of Omaha was sentenced Thursday in Buffalo County Court. Authorities say she set of off an M-80 firecracker while police were investigating an emergency alert on campus.

Castater pleaded no contest to attempted possession of a destructive device and disturbing the peace. Both charges are misdemeanors. A university spokeswoman says Castater is no longer a student at the university.

The probation requires Castater to complete outpatient therapy.