North Korea confirmed on June 30 its second missile test in recent days.
A report by the North's official KCNA news agency did not specify the type of missile tested, mentioning "tactical rockets" and "precision-guided missiles."
KCNA said leader Kim Jong-Un oversaw the drill.
The South Korean military said the June 29 test was of two short-range Scud missiles with a range of about 500 kilometers.
Several days earlier, a similar KCNA report had hailed the test of a new "cutting-edge" guided missile as a "breakthrough" in the North's military capability.
Pyongyang has in the past made extravagant claims about its ballistic missile capability.
Experts are divided as to how far the reclusive communist state has gone in developing its missile systems under United Nations sanctions.