WASHINGTON — Top federal and state officials today announced a broad crackdown on mortgage modification scams, accusing "criminal actors" of preying on desperate borrowers caught up in the nation's housing crisis.

Government officials say scammers are seeking to take advantage of borrowers in danger of default. The frauds often involve companies with official-sounding names designed to make borrowers think they are taking advantage of the Obama administration's efforts to help modify or refinance 7 to 9 million mortgages.

Officials say such operations almost always are fraudulent, and that help is available for free from government-approved housing counselors.

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