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.

The U.S. Department of Education is investigating Denver Public Schools after a high school girls’ restroom was converted into an all-gender restroom.