MTA officials on Thursday offered a brief response to union accusations that managers are threatening to fire some employees if they go on strike.

A memo by an MTA labor relations official to LIRR employees Tuesday warned that probationary employees are required to show up to work during a strike. “Failure to do so may result in your termination,” the memo said.

Union officials have called the apparent threat “troubling” and potentially illegal.

Asked about the letter, the MTA in a statement said only: “All LIRR employees are required to report to work.”

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