CHARGING THAT Eastern District prosecutors withheld a critical statement made by Abner Louima during the investigation into his 1997 assault at a Brooklyn police station, defense lawyers argued in court papers filed yesterday that the government should be sanctioned by having the civil rights charges against former officer Charles Schwarz dismissed.

Attorney Ronald P. Fischetti said the government has only now released a report concerning Jean-Claude Laurent, an advisor to the Louima family, who purportedly told the Federal Bureau of Investigation in 1997 that Mr. Louima had told him four police officers were present in the bathroom during the incident.