North Korea flies warplanes near South Korea after missile launches

North Korea flew 12 warplanes near its border with South Korea on Thursday, prompting the South to scramble 30 military planes in response, officials in Seoul said (Lee Jin-man/AP)

North Korea flew 12 warplanes near its border with South Korea on Thursday, prompting the South to scramble 30 military planes in response, officials in Seoul said.

The highly unusual incident came hours after North Korea fired two ballistic missiles into the sea in its sixth round of missile tests in less than two weeks.