This is a developing story. Please check back for updates. (Last updated at 10:55 a.m. KST on March 16, 2023 with additional details from Japanese government, background on last year's failed missile launch)

North Korea has fired an unidentified long-range ballistic missile toward the East Sea (Sea of Japan), its fourth launch event in about a week, South Korea’s Joint Chiefs of Staff (JCS) announced Thursday morning.