The Oklahoma school district where a transgender student died earlier this year following an altercation in a school bathroom violated federal law by mishandling sexual harassment allegations, according to an Education Department investigation.

The Department of Education’s investigation reveals how Owasso Public Schools in Oklahoma were handling student complaints of harassment and bullying.

After the suicide of a nonbinary student last February spurred a monthslong federal investigation, the US Department of Education found Title IX violations in an Oklahoma public school district including multiple failures to respond to notices of sexual harassment.