Cori Beard, 28, of 330 Farmington Lane in Vernon Hills, is charged with 12 counts of criminal sexual assault stemming from an investigation launched Thursday, when a parent of one of the students involved contacted a school staff member.
The charges allege Beard was involved in unlawful sexual acts with the students between December 2016 and February, according to police.
"As a community we all feel saddened we're dealing with this investigation," Police Chief Patrick Kreis said.
Beard, who has been employed by Libertyville-Vernon Hills High School District 128 for three years, serves as a part-time assistant soccer coach for both the boys and girls soccer teams at Vernon Hills High, police said.
Kreis declined to say Saturday whether the students involved played soccer for Beard. There is no indication the acts occurred on campus, he said.
"At least some of the crimes occurred at Beard's residence," Kreis said, adding the boys were under 17 years old when at least some of the conduct took place.