North Korea apparently failed with an attempted missile launch Tuesday, the latest in a series of setbacks for a ballistic weapons program that aspires to threaten the US mainland, AFP reports.

South Korea's defense ministry detected the dawn launch effort, which Japan condemned as an unacceptable and "provocative" act.

The ministry declined to speculate on the missile type, but military sources cited by local media said it was a powerful, medium-range "Musudan" that has already undergone three failed launches this year.