Seattle’s Franklin High School was closed Thursday and could remain closed Friday because of teaching staff shortages, the school district said on its website.

The school closed when faced with “an unexpected shortage of critical teaching staff,” Seattle Public Schools said. Of 120 classified and certified staff, 61 were absent Thursday, Seattle Public Schools spokesperson Tim Robinson said in an email.

If staff absentee rates remain the same or increase Friday, the school will again cancel classes. But Robinson said students should be prepared to go to school.

Missed classes will be made up at the end of the year, the district said.

“Franklin High has experienced higher than normal absenteeism for much of the school year, and the district continues to face a shortage of substitute teachers,” Robinson said. “We are working to find solutions to both issues.”

Staff shortages closed schools in Seattle, Bellevue and Kent last month.

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Franklin was closed Wednesday as well, after an online social-media threat directed at the school. Seattle police determined it was a hoax, Robinson said, but “it could be that those concerns may be part of the higher than usual number of absences.”

At least five other threats of violence in Seattle schools have been investigated this month. A national threat of school shootings is currently circulating on social media.

In a statement Thursday, the King County Sheriff’s Office said it will remain vigilant in assessing social media comments about threats of violence to schools. The Sheriff’s Office said it is unaware of any credible threats to schools in the county.