DEKALB, Ill. (CBS) – Authorities have scheduled a news conference for later Tuesday morning to update the search for missing Northern Illinois University freshman Antinette “Toni” Keller.

A source has told CBS 2 that DeKalb County State’s Attorney John Farrell will be at the briefing, prompting speculation that an arrest either has been made in Keller’s disappearance, or that one is imminent.

The news conference is scheduled for 11 a.m.

Meanwhile, security has been tightened on campus. There are increased patrols by both NIU and DeKalb City Police, and there are late night rides available for students traveling across campus.

Chicago NIU junior Belisa Richmond got one of those rides. She told CBS 2’s Mike Parker she has stopped walking alone on campus.

“Now I’m taking advantage of using the escorts, as well as the late night services, and they also extended their hours from 4 p.m. to 8 a.m.,” Richmond said, adding that she was “very much” looking over her shoulder frequently.

Keller was a 2010 graduate of Neuqua Valley High School, and was majoring in art at NIU. Keller was active in art and music while she was in high school, Neuqua Valley Principal Bob McBride said.

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