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The mayor of Atlantic City made headlines last month when he was involved in a fight outside a casino that was captured on video. The mayor, Frank Gilliam, was not charged.

But Mr. Gilliam may be facing more serious trouble. Early Monday, federal officials raided his home, removing computer equipment and boxes in an operation that represents another setback for this struggling seaside city.

“The F.B.I. was at the mayor’s home in Atlantic City in an official capacity executing a search warrant,” said Doreen Holder, a spokeswoman for the F.B.I.’s office in Newark. Ms. Holder said the I.R.S. was also involved in the search, but she declined to offer any other details.