The F.B.I. had been investigating Mr. Giordano for corruption for two years before arresting him in July 2001; it was only after cellphone intercepts indicated that the mayor was sexually abusing the girls that federal agents apprehended him with the help of the prostitute, whom agents filmed accepting a cash payment from Mr. Giordano as he sat in his official car. Today, Michael Wolf, the head of the F.B.I.'s Connecticut bureau, said that the corruption investigation was still active, but he did not provide details. ''It will unroll in due time,'' he said. Mr. Jongbloed said that Mr. Giordano would play ''no role'' in the ongoing corruption investigation. Asked why not, Mr. Jongbloed asked a reporter, ''Did you find his testimony credible?''