NEW YORK (AP) — U.S. stocks are slumping on Thursday, hurt by drops for midsized banks as worries flare about the loans they’ve made.

The S&P 500 fell 0.7% in its latest up-and-down day after erasing a morning gain. The Dow Jones Industrial Average was down 284 points, or 0.6%, as of 2:45 p.m. Eastern time, and the Nasdaq composite was down 0.7%.

Zions Bancorp. tumbled 12% after the bank said its profit for the third quarter will take a hit because of a $50 million charge-off related to loans made to a pair of borrowers. Zions said it found “apparent misrepresentations and contractual defaults” by the borrowers and several people who guaranteed the loans, along with “other irregularities.”

Another bank, Western Alliance Bancorp dropped 10.4% after saying it has sued a borrower, alleging

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