LOS ANGELES � Federal prosecutors in the Milberg Weiss case filed court papers on Monday opposing the New York securities firm’s recent motions to dismiss and revealed new details about a fax at the heart of the government’s case.

Prosecutors allege that Milberg Weiss and seven of its lawyers paid $11 million in illegal kickbacks to lead plaintiffs. Last month, Milberg Weiss filed motions to dismiss some of the charges. Melvyn Weiss, founding partner of Milberg Weiss who was indicted last year, joined in several of those motions.