The latest on teacher complaints about Detroit public schools (all times local):

8 a.m.

Many Detroit schools are closed again because of an absence of teachers, although the number has dropped.

The district reported at least 22 closings Tuesday, compared to more than 60 Monday. The so-called sick-out started last week with a handful of schools.

Teachers are upset over class sizes, pay, the condition of buildings and a plan by Gov. Rick Snyder to deal with millions of debt by creating a new district.

At a rally Monday, teacher Theresa Williams held a sign that said, "I have 39 first-graders in my classroom."

There are 100 schools in the district.

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1 a.m.

Detroit Mayor Mike Duggan plans to tour some public school buildings following complaints by a teachers union about rodent infestations and mold.

Duggan says in a statement that based on what is found during Tuesday's tour, "the city of Detroit will take whatever enforcement action is necessary to make sure all Detroit public schools are compliant with all health and building codes."

The complaints by the Detroit Federation of Teachers followed a wave of absences by teachers that forced the financially troubled district to close 64 schools Monday. The teachers union is not part of the so-called sick-outs.

Teachers have undertaken the sick-outs to protest their pay and call for smaller class sizes, among other things.