Among the sector activity stories for Monday, March 30, from AP Financial News:

WASHINGTON (AP) ¿ Shares of Aluminum Corp. of China Ltd. and other U.S. metal makers tumbled Monday after the company warned of a first-quarter loss and the Obama administration mulled the viability of a controlled bankruptcy of automakers General Motors and Chrysler.

NEW YORK (AP) ¿ Stocks of heavy machinery manufacturers tumbled Monday as crane maker Manitowoc Co. retracted its full-year guidance and the broader market fell on fresh challenges for General Motors Corp. and Chrysler LLC.

NEW YORK (AP) ¿ Shares of freight railroad companies fell Monday as the broader market stumbled and a Goldman Sachs analyst lowered earnings estimates of railroads due to a slump in shipment volumes.

PHILADELPHIA (AP) ¿ Shares of NCR Corp. and Diebold Inc. fell sharply on Monday after a Baird analyst downgraded both ATM makers in light of expected weakness in bank spending on these machines for the next several quarters.

NEW YORK (AP) ¿ Airline shares joined the broader market sell-off Monday morning, as investors worried that looming bankruptcy for General Motors and Chrysler means more serious problems ahead for the rest of the economy.

NEW YORK (AP) ¿ Regional casino operators may have better-than-expected first-quarter earnings on continued cost control efforts, a Goldman Sachs analyst said Monday as she raised price targets on some of the stocks.

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