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The unusually eventful post-season at the Metropolitan Opera continued on Wednesday morning when some administrative offices inside the opera house were vandalized with spray paint, the police and the company said.

“At some point this morning, some administrative offices at the Metropolitan Opera house were vandalized with spray paint,” the Met said in a statement. “There was little or no permanent damage. The New York City Police Department is investigating. We have no further comment at this time.”

Around 8 a.m. Wednesday, a maintenance worker discovered obscene messages spray painted inside the Metropolitan Opera House at Lincoln Center, the police said.

There were no signs of a break-in, the police said, and investigators believe that the vandal, who spray-painted on some paintings and sculptures — as well as on part of a band shell at Lincoln Center — is someone with access to the building. The police said that the episode could be related to an ongoing labor dispute at the opera house.

But some people who have seen the graffiti, and at least one union leader, expressed doubts that the vandalism was tied to the contract talks. “I don’t see it being related to the labor dispute,” said Alan S. Gordon, the executive director of the American Guild of Musical Artists, which represents the chorus, singers and stage managers, and is one of 15 unions that is negotiating a new contract at the Met. “Nobody’s that crazy.”

Although the opera season ended more than a month ago, the Met has been in the news a great deal recently. The company is in the midst of heated labor talks, in which it is seeking concessions from its unions. And last week the Met announced that it was canceling plans to transmit “The Death of Klinghoffer” to movie theaters around the world this fall, after some Jewish groups expressed concerns about the opera, which is about a 1985 terrorist incident.

One person who saw the graffiti but was not authorized to describe it publicly said that it did not seem to refer to either controversy, but that it consisted largely of vulgarities.