Japan warned of possible nuclear leak from US sub

TOKYO: Japan's Foreign Ministry says the U.S. Navy has warned that a nuclear sub may have had radioactive leaks during recent port calls in southern Japan.

The Foreign Ministry said in a statement on Saturday that the U.S. Navy told it a small amount of radiation might have leaked from the nuclear-powered submarine USS Houston as it traveled around the Pacific. The Houston made calls in March and April in the southern Japanese naval ports of Sasebo and Okinawa.

The ministry said the leak on USS Houston was detected during its routine maintenance in Hawaii in June and it was believed to have posed no threat to humans or the environment.