Mayor Lori Lightfoot and Chicago Public Schools CEO Pedro Martinez said in a joint statement Sunday evening that there wasn’t “sufficient progress” in talks to resume in-person classes Monday, extending disruptions into a second school week. But they vowed negotiations would continue “through the night.”

Disputed issues included testing and metrics to close schools. The Chicago Teachers Union wants the option to revert to districtwide remote instruction, and most members have refused to teach in-person until there’s an agreement, or the latest COVID-19 spike subsides. But Chicago leaders reject districtwide remote learning, saying it’s detrimental to students and schools are safe. Instead, Chicago opted to cancel classes as a whole two days after students returned from winter break…

The district, which deems the fight an “illegal walkout,” said late Saturday it will allow more incentives for substitute teachers, provide KN95 masks for all teachers and students, and that Illinois will provide about 350,000 antigen tests. But both sides remained at odds on key issues including COVID-19 metrics that will lead to individual school closures and compensation. The district said it won’t pay teachers failing to report to schools, even if they tried to log into remote teaching systems. The union doesn’t want any of its roughly 25,000 members to be disciplined or lose pay.