OLATHE, Kan. (AP) — A 13-year-old says she was sexually assaulted inside a child welfare office in Kansas as she slept in a conference room.

A newly released affidavit says the teen told authorities that Michael Anthony Hamer climbed under a blanked with her in May at the KVC Behavior Healthcare office in Olathe and began touching her. She later told a worker and authorities that she had been assaulted.

Hamer, who turned 19 Wednesday, was charged earlier this month with rape and aggravated indecent liberties of a child.

A KVC spokeswoman says the social worker had gone to get supplies and had only left the two unsupervised for “five minutes or less.” The two teens were at the office awaiting placement in a foster home or facility.