KANSAS CITY, Mo. – A high school girl alleges she was raped by a classmate at school in an encounter that started as consensual kissing in a stairwell and quickly escalated.

The alleged victim told a tutor Monday that a boy asked to meet her in a fifth floor stairwell at the African Centered College Preparatory Academy during their lunch hour, where the two started kissing, KSHB reports.

“She says he started groping her and that’s when she said ‘no,’” according to the news site. “But according to the female student, the boy continued until he raped her.”

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The alleged victim finished the school day before reporting the incident to her tutor, who passed the information on to school officials and the police.

The Kansas City Star reports district officials described the incident Tuesday as “inappropriate touching,” and said they’re working with police and conducting an independent investigation.

African Centered College Preparatory Academy issued a statement claiming that school staff “took all the correct steps per policies and procedures when they were informed of the alleged incident that afternoon.”

The school offered the alleged victim counseling, and launched an investigation that “will be thorough, will be done with appropriate due process for the individuals involved and will examine what – if any – steps need to be taken to help prevent a similar incident from happening again,” according to the statement cited by the Star.

The alleged attacker was still at school when police arrived a little after 3 p.m. Monday, when he was questioned and hauled to a juvenile detention center. It’s unclear whether the student was charged with a crime. The ages of the students involved also were not detailed in media reports. Kansas City Police officer Darin Snapp told KSHB the investigation is ongoing.

“They do have cameras in the school, and we’re looking at those,” he said, adding that officials are analyzing factors that may have contributed to the encounter.

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“There was no one there during lunch, so we’re trying to work with them to figure out a way that someone at least knows if students go hide somewhere in the school,” Snapp said.