By Dakin Campbell and Prashant Gopal – Oct 8, 2010 5:43 PM ET

Attorneys general in about 40 states may announce a joint investigation into foreclosures at the largest banks and mortgage firms, according to a person with direct knowledge of the matter.

State attorneys general led by Iowa’s Tom Miller are in talks that may lead to the announcement of a coordinated probe as soon as Oct. 12, said the person, who declined to be identified because a final agreement hasn’t been reached. The number of states may change because several are still deciding whether to join the investigation, the person said. New Mexico Attorney General Gary King said today in a statement that his state will join a multi-state effort.

Lawyers representing the banks are expecting a more widespread investigation, according to Patrick McManemin, a partner at Patton Boggs LLP, a Washington-based law firm that represents banks, loan servicers and financial institutions. Bank of America Corp., the biggest U.S. lender, today extended a freeze on foreclosures to all 50 states.

“We are aware of or involved in a large number of investigations that lead us to believe there are in the neighborhood of 40 state attorneys general who have initiated investigations or expressed an interest,” McManemin said in a telephone interview.

Continue reading …BLOOMBERG

.