A US official says a North Korean rocket due to be launched next month may affect an area between Australia, Indonesia and the Philippines.
US Assistant Secretary of State Kurt Campbell is reported to have asked the three countries to condemn the launch.
North Korea says the rocket will take a new southern trajectory instead of a previous route east over Japan.
Japan is readying anti-missile defences around the southern islands of Okinawa, which could be under the flight path.
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