The weapons North Korea launched over the weekend traveled into the stratosphere and flew at a distance long enough to strike deep into South Korean territory, according to a South Korean assessment.

South Korea's Joint Chiefs of Staff did not indicate what was fired off of North Korea's east coast on Saturday and into the sea, but experts believe at least one ballistic missile was launched and the testing may indicate that North Korea has improved its capabilities to strike the South.

The multiple short-range projectiles were fired on Saturday from 9:06 a.m. to 10:55 a.m. and reached altitudes of between 20-60 kilometers (12-37 miles). They covered a distance of about 70 to 240 kilometers (45 to 150 miles), Kim Joon-rak, a spokesman for the Joint Chiefs of Staff, told reporters at a briefing.