Pedro Martinez, Chicago Public Schools’ new CEO, said Thursday the district will provide more COVID-19 testing and work harder to keep families in the loop on case information amid confusion and criticism through the first month of the school year.

Dr. Allison Arwady said investigators have not found any evidence that COVID-19 had been transmitted to students or teachers at Jensen Elementary School. “I know people are worried,” Arwady said. “The desire when something tragic like this happens is to pin blame on someone or something. But the blame here really belongs to the virus.”