Three teenagers were arrested for attempting to rape a 12-year-old girl in a Brooklyn school, according to police.

It happened on Oct. 6, inside the Mott Hall No. 4 Middle School in Brownsville between 4:45 and 5 p.m. on Thursday, police say.

The three boys, who range from ages 12 to 14, allegedly approached the 12-year-old girl at the bottom of a basement stairwell, shoved her to the ground and stole $4 and a bus pass from her.

However, police say another boy in the group pinned the girl to the ground then pulled her pants down and began touching her inappropriately.

There are actually three schools in the one building. In addition to Mott Hall, there's the Ocean Hill Collegiate Charter School and the Eagle Academy for Young Men.

News 12 is told that the victim was a student at the charter school. 

The Department of Education released a statement saying "The NYPD was notified of an alarming incident that was reported at a school in Brooklyn. We are working closely with the NYPD as they conduct an investigation, and are providing the school and family with ongoing support."

The incident occurred after school hours, and investigators are looking into why the kids were still in the building and how they were able to get in there. 

Parents were appalled at the incident and very concerned as to why they were not made aware of the incident sooner.

"School was closed Monday for the holiday, so as soon as we had details that we could share on Tuesday, we began informing parents and they will all get a letter home today," says a spokesperson for Ocean Hill Collegiate Charter School. 

A 14-year-old and two 12-year-olds are facing a slew of charges that include attempted rape and false imprisonment.