Minneapolis school Superintendent Bernadeia Johnson says the district's investigation is continuing into student credits at Broadway High School.
Students at Broadway have been told in recent weeks that some of the credits they've received might not be valid for graduation.
The issue is whether some teachers at Broadway didn't have the proper licenses for classes they were teaching. Two administrators are on leave, including former principal Beverly Davis.
Johnson released a statement Thursday, saying what the Broadway situation is "unacceptable" and the investigation continues.
She added the district will honor all credits that have been awarded, but some credits will no longer count for core classes, like reading and math. Johnson acknowledges that will keep some students -- possibly as many as 19 seniors 00 in school longer to graduate.
"What is hard, I think, for them -- and I understand it -- is they've put in the time," she said. "Our responsibility is to try to create an educational plan for them that help them get the graduation credits."
Johnson says those plans could include longer school days or even Saturday classes.
When asked how something like this could have happened, Johnson responded that that's the question she's still trying to figure out.