International stocks trading in New York closed lower Tuesday, with the Bank of New York index of American depositary receipts dropping 0.7% to 148.84. The European index fell 0.6% to 149.95, the Asian index dropped 0.9% to 141.93, the Latin American index shed 0.3% to 250.86 and the emerging markets index declined 0.8% to 260.21. Among the companies with shares that actively traded were Vale SA (VALE, VALE3.BR, VALE5.BR) and Barclays PLC (BCS, BARC.LN).

Copper and iron ore prices have stumbled due to worries about slowing demand in China, the world's biggest buyer of the two commodities, which has weighed on shares of miners. The U.K.'s Rio Tinto PLC (RIO, RIO.LN) shares fell 0.8% to $51.93, while Brazil's Vale dropped 2.1% to $12.54.

A U.S. investment-management firm has filed a lawsuit against the five banks that set the London benchmark gold price, alleging that the banks conspired to manipulate the price of gold for their own gain. Documents seen by The Wall Street Journal show that AIS Capital Management filed a class-action complaint late Monday against Barclays, Deutsche Bank AG (DB, DBK.XE) and HSBC Holdings PLC (HSBC, HSBA.LN), among others, in the U.S. district court for the Southern District of New York. Barclays shares fell 3.4% to $15.73, Deutsche Bank shares dropped 1.4% to $45.86 and HSBC shares edged down 0.3% to $51.46.

Lloyds Banking Group PLC (LYG, LLOY.LN) on Tuesday announced changes to its defined benefit pension schemes, and said that the changes would have a one-off benefit of 1 billion pounds ($1.68 billion) to its income statement. Shares slipped 1.3% to $5.41.

Write to Anna Prior at anna.prior@wsj.com

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