Last Updated: June 19, 2008

WASHINGTON (CNN) — Hundreds of people across the country have been arrested by law enforcement officials targeting crooked mortgage brokers, real estate agents, and other industry officials, the head of the FBI and a top Justice Department official said Thursday.

FBI Director Robert Mueller and Deputy Attorney General Mark Filip announced the arrests the same day two former Bear Stearns hedge fund managers, Ralph Cioffi and Matthew Tannin, surrendered to the FBI.

More than 400 people have been charged in the mortgage fraud probe, of whom nearly 300 have been arrested, including 60 in a coordinated sweep Wednesday, the Justice Department said.

The losses in the mortgage fraud cases cost consumers more than $1 billion.

“We will, as appropriate, seek prison terms,” Filip said. “It is a very, very serious matter.”