Yonhap news agency, citing an unidentified South Korean government official, said the North test-fired the missiles on Monday afternoon from its eastern coastal launch pad.
Yonhap said the North has issued a no-sail zone in an area off the east coast Oct. 10-20 _ an apparent indication it was planning missile tests.
Calls to the South Korean Defense Ministry seeking comment on the report were not immediately answered Monday.
Earlier Monday, South Korea proposed working-level officials of the two sides meet Wednesday discuss how to prevent floods in the Imjin River running through their heavily armed border. The South also proposed a separate meeting of Red Cross officials on Friday to discuss reunions of families separated by the 1950-53 Korean War.
However, Unification Ministry spokesman Chun Hae-sung said that Seoul had no plan to resume high-level dialogue with the North.
Pyonyang has recently reached out to Seoul, easing months of tension over the North's nuclear and missile programs.