Police: Man sexually assaults 15-year-old girl in Albert Einstein High School copy room

Osmin Sosa-Mendrano (Montgomery County Police Department)

KENSINGTON, Md. (ABC7) — A 15-year-old girl was sexually assaulted within a copy room at Albert Einstein High School, in part, due to an unlocked exterior door, Montgomery County Police say.

Authorities explain the suspect, Osmin Sosa-Mendrano, 21, first connected with the teenage victim on Instagram. After meeting in person, the two began a dating relationship. Sosa-Mendrano allegedly told the girl to keep quiet about their six-year age difference as it could get him in trouble.

On Sunday, Sosa-Mendrano picked up the teenage girl at her mother's home. It was around 11:30 p.m. The two chatted in Sosa-Mendrano’s vehicle before driving to Albert Einstein High School located in a residential community along Newport Mill Road.

According to court documents, Sosa-Mendrano and the girl entered the main school building through an "open door" and ducked into a copy room filled with boxes of paper.

Sosa-Mendrano allegedly told the girl to remove her clothing and sit on the ground. Following several minutes of sexual conduct, a box fell and made a loud noise, startling Sosa-Mendrano. Spooked, the duo put their clothes back on and exited the copy room. Montgomery County officers responding to an active burglary call at the high school caught the couple walking the halls.

While speaking with detectives, Sosa-Mendrano reportedly confessed to dating the 15-year-old girl and engaging in sexual intercourse with her on the copy room floor that night. He was arrested and charged with one count of third-degree sexual offense.

In an email to ABC7, Montgomery County Public Schools credited its security team for Sosa-Mendrano's quick arrest. MCPS also defended its decision to not notify the Albert Einstein High School community about the sexual offense, which occurred on school grounds.

"This incident happened after hours, was unrelated to school activities and did not impact instruction, therefore a letter was not sent home," MCPS spokeswoman Gboyinde Onijala wrote Thursday. "It was a matter for the police and they responded promptly once they were alerted to the break in by our security staff."

According to court documents, Sosa-Mendrano was born in El Salvador. He lived in Los Angeles and North Carolina before moving to Hyattsville earlier this year. He works as a painter.

On Tuesday, Sosa-Mendrano posted his $5,000 bond and was subsequently released from jail. He is scheduled to appear in Montgomery County District Court on June 22, for a preliminary hearing.

Sosa-Mendrano faces up to 10 years in prison. No defense attorney is currently listed in court paperwork.

This story has been updated Friday, May 25, 2018

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