A single flush of a toilet at Florida's Orlando International Airport over the weekend ended up delaying thousands of passengers as a hazmat team cleaned up sewage that flowed into one of the airport's customs areas.

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An investigation is ongoing into what caused the toilet issue, but it appears someone was trying to flush the contents of a suitcase, officials said.

The flooding caused passengers flying into Orlando from outside the country to be bused to a customs area on the opposite side of the airport Saturday, Sunday and Monday.

Traveler Mike Ortiz said getting through the ordeal took a lot of time.

“As soon as we landed, they immediately told us that there were problems with the terminal and we would have to sit there on the tarmac for a while,” he said. “There were carpets ripped up and there were floor fans trying to air out what was, I guess, some flooding going on.”

Officials at the airport said they were still looking into what was flushed and who flushed it, but their immediate efforts had been to get the customs area reopened.