The story

A U.S. Navy submarine leaked trace amounts of radioactive water for two years as it made port calls in Japan and other Asian nations, the Navy said Thursday.

Last week, Navy officials told Japan that the USS Houston, a Los Angeles-class fast attack submarine, had made one port call -- in March -- while leaking the contaminated fluid.

But after reviewing records of the sub, the Navy told Japanese officials Thursday that the Houston had been leaking much longer, since June 2006, and had made port calls to Japanese bases at Sasebo, Yokosuka and Okinawa before the leak was discovered. Read full article »

CNN's Kyung Lah contributed to this report.

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