The ballistic missiles that North Korea test-fired this weekend were likely capable of striking key government and military facilities in South Korea, a defense official said Sunday, amid growing concerns over Pyongyang's firepower, AP reported. North Korean state media did not mention the launches but boasted that the country's military could impose «merciless punishment» on those who provoke it. Pyongyang launched seven missiles into waters off its east coast Saturday in a show of force that defied U.N. resolutions and drew international condemnation. The missiles appear to have traveled about 250 miles (400 kilometers), meaning they could have reached almost any point in South Korea, an official at the South Korean Defense Ministry said on condition of anonymity, citing department policy. The official said the exact details of the launches were still under investigation.