Investigators with the state attorney general's office have linked a Republican campaign to letters sent to Hispanic families last week warning that some immigrants could be jailed or deported for voting next month, an agency spokesman said Wednesday.

Nathan Barankin, a spokesman for Attorney General Bill Lockyer, declined to identify the campaign, citing the ongoing investigation.

"We believe it's linked to a particular Republican campaign," Barankin said in a telephone interview from Sacramento. "We have identified where we believe the mailing list was obtained."