NEWARK (CBS SF) — Threatening Twitter messages directed at students by a Newark teacher were “inappropriate and unprofessional” but were not criminal, police said Thursday.

Krista Hodges, a teacher at Newark Memorial High School, was reprimanded last month after reports of the tweets surfaced, but was still employed by the school, Newark Unified School District officials said.

The tweets were written in April, May and June of this year, according to police.

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Police said that while they did not receive complaints from any victims, they opened an investigation into the alleged threats, interviewing teachers, students, administrators and other school staff.

However, the investigation found that the tweets did not rise to the level of criminal threats. Police investigators turned the case over to the Alameda County District Attorney’s Office, which declined to file charges, police said.

School district interim Superintendent Timothy Erwin said last month that the district had taken action over the messages but did not specify what action was taken.

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