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St. Ignatius High School is closed Thursday because of a bomb threat toward the school, officials said.

(Patrick O'Donnell, Plain Dealer file photo)

CLEVELAND, Ohio -- Classes were canceled at St. Ignatius High School on Thursday after a bomb threat was directed at the campus, officials said.

An unidentified male called the Cleveland police department about 4:30 a.m. with a threatening message, according to a news release from the school. A bomb squad was immediately sent to the campus.

"While the threat has not yet proved credible, due to an abundance of caution, school officials chose to cancel classes and close the campus for the day," the release says.

Cleveland police did not immediately respond to a request for details about the threat.

Classes are expected to resume tomorrow, officials said.