The test is believed to have been of short-range, anti-ship missiles, according to South Korea’s Joint Chiefs of Staff, which closely monitor North Korean military activities.

The projectiles were fired from the east coast and landed approximately 150 kilometers east of the peninsula, in the Sea of Japan, which Koreans call the East Sea. The drills continued for about 40 minutes, the JCS said.

It was North Korea’s fifth test this year. Four separate tests of various missile systems were conducted last month.