LOS ANGELES (CBS) — A teacher’s aide with the Los Angeles Unified School District has been arrested on suspicion of attempting to have sexual contact with a 15-year-old student.

Alain Salas, 40, was arrested Monday at Fremont High School and booked for allegedly contacting a minor with intent to commit a sexual offense, according to FBI spokeswoman Laura Eimiller.

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“The Los Angeles County District Attorney’s Office is expected to file formal charges against Mr. Salas in the near future . . . . The S.A.F.E. Team is working with the alleged victim’s family and the school district, and is continuing to investigate the nature and extent of the allegations,” Eimeiller said in a statement.

According to the FBI, Salas tried to contact the victim online and in person.

Salas, who worked at Fremont High since 2006 as an aide for special education students and a coaching assistant for the girl’s volleyball and softball teams, is being held without bail at the Los Angeles Inmate Reception Center. He is expected to appear in state court Wednesday.

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Salas is the fourth LAUSD employee to be arrested within the last few weeks.

Teachers Mark Berndt, 61, and 49-year-old Martin Springer also face felony charges of lewd acts on a child.

Berndt, a 30-year teaching veteran, faces 23 counts of lewd acts on a child and is being held on $23 million bail.

Paul Adame, a janitor at a San Fernando Valley elementary school, was arrested Feb. 6 for lewd acts on a child.

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The LAUSD has yet to comment on Salas’ arrest.