A North Korean ballistic missile launch (Photo: KCNA/VNA)

The missiles were fired vertically and flew for 2 hours and 10 minutes before hitting their target, KCNA said.

Pak Jong Chon, Vice-Chairman of the Central Military Commission of North Korea and Secretary of the Korean Workers’ Party, said important successes are being made in developing North Korea's nuclear forces according to the plan set by the country's ruling party.