North Korea fired multiple short-range ballistic missiles on Wednesday toward its east coast, South Korea and Japan said, days after Pyongyang unveiled a uranium enrichment facility and vowed to beef up its nuclear arsenal.

South Korea’s Joint Chiefs of Staff said it detected North Korea firing multiple short-range ballistic missiles from north of its capital, Pyongyang, and said they traveled about 400 kilometers (244 miles) while flying toward the northeast.

North Korea successfully tested a new ballistic missile capable of carrying a "super-large conventional warhead," Pyongyang's state media reported on Thursday. State-controlled KCNA news agency quoted the country's Missile Administration as stating the test-fire,