Wall Street closed an erratic session mixed today after an uneven batch of earnings reports made investors more cautious about buying stocks.

APPLE Computer has recalled 1.8 million Sony-built laptop batteries that could overheat and catch fire.

Wall Street managed a moderate gain today in a volatile session that saw investors alternating between worries about interest rates and delight in a new wave of merger deals.

Investors, shifting their focus from the economy to a possible second-half profit slump, sent technology and small-cap stocks sharply lower today, moving Wall Street toward another losing week.

NEC Corp and Toshiba Corp have agreed to jointly develop next-generation magnetic random access memory chips, which are expected to greatly reduce power consumption for personal computers, cellular phones and other portable electronic devices, the Nihon Keizai Shimbun reported, citing sources at the companies.