A school district near Buffalo, N.Y., delayed the beginning of its school year on Friday for students learning remotely, releasing a statement blaming the move on dozens of resignations and sick leave requests from teachers in the district.

In a statement released Friday, the Williamsville Central School District said students learning remotely or through hybrid models would see their school years delayed indefinitely. Those returning to in-person hybrid learning models would apparently see their classes start on Tuesday.

The statement blamed the decision on 90 school employees who requested sick leave absences due to COVID-19 as well as the resignations of more than 100 employees.

“Delaying the start of our fully remote online learning model is currently the best path forward,” said the district’s superintendent, Scott Martzloff.