CHICAGO (CBS) — The head of the Chicago Public Schools district said it’s making good progress in offering COVID-19 vaccinations to staff members.

“We have offered a vaccine to all Chicago Public Schools employees as well as vendors who work in our buildings,” said CPS CEO Janice Jackson.

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The announcement comes after CPS set a target date of April 19 for high school students to return to in-person learning. But the Chicago Teachers Union is accusing CPS and Mayor Lori Lightfoot of misrepresenting the status of negotiations.

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CTU released a statement on the matter.

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“We have no agreement on returning to in-person learning in high schools or any date, nor will there be an agreement until we know our school buildings can reopen safely.”