An all-gender restroom at East High School in Denver is the subject of an investigation launched by the U.S. Department of Education.

The U.S. Department of Education said on Tuesday it is investigating the Denver schools system for allegedly discriminating against women and girls by converting a female bathroom to all-gender.

DENVER (AP) — The U.S. Education Department said it is investigating Denver Public Schools for alleged discrimination after the district converted a girl’s restroom on the second floor of East High School into an all-gender restroom while leaving the other bathroom exclusively for male students.