WASHINGTON - Bank of America today halted foreclosures on homes  across the country so it could review paperwork in tens of thousands of  cases for flaws, expanding a crisis at a perilous time for the housing  market.

The move came as PNC Financial Services became the fourth major bank  to announce that it would stop foreclosures in at least some states. It  added to growing concerns that mortgage lenders have been evicting  homeowners despite flawed court papers.

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