Three elementary-age boys have been charged with attempted sexual assault, with authorities saying the boys pinned down a classmate on the school playground and tried to remove her clothes.

Authorities say the boys and the victim were all 8 years old when the assault happened in February at Omaha’s Belvedere Elementary School. An attorney for the girl’s family, Brian Jorde, says a group of other third-graders rescued the girl, whose nose was bloodied in the assault, from her attackers.

The girl’s parents say they weren’t contacted about the assault until hours after it had happened, and that the school did not call police. The girl’s mother called police the evening of the attack.

School officials did not immediately return messages Friday. The girl has transferred to another school.