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A Spanish Fork school teacher has been arrested after an alleged sexual encounter with a 17-year-old male student.

Sarah Lewis, a 27-year-old social studies and dance teacher at Landmark High School in Spanish Fork, was arrested on Jan. 24.

Payson police Lt. Bill Wright expects Lewis to be charged for unlawful sexual activity with a minor, a third degree felony, and providing alcohol to a minor, a class A misdemeanor.

The incident happened at Lewis' Payson home in early January, and "whether it was planned or spontaneous, we don't know," said Wright.

Police are still investigating, but believe it was a one-time occurrence.

"It's a tragedy that things like this occur," said Wright. "It's one of those mind-bogglers. You have to shake your head at it."

Twitter: @tiffany_mf