N.Korea test-fires at least three missiles, one of them a long-range weapon that the U.S. has been monitoring, U.S. sources say.

North Korea launched at least three missiles early Wednesday -- one of them the long-range Taepodong-2 missile, according to U.S. political and military sources. A senior State Department official tells CNN the Taepodong-2, which U.S. analysts fear could hit the western United States, appears to have failed in mid-air. The short-range missiles landed in the Sea of Japan.

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