Two projectiles were launched from the North Korea's east coast on Saturday.

North Korean leader Kim Jong Un oversaw the test-firing of what the country’s state media said was a new type of tactical guided weapon aimed at boosting its nuclear capabilities, following a series of provocative missile launches that allow Pyongyang to diversify its arsenal.

Two projectiles were launched from North Korea’s east coast around 6 p.m. local time on Saturday, flying about 68 miles and reaching an altitude of about 15 miles, South Korea’s military said. Seoul usually sends alerts about Pyongyang’s missile launches minutes after they occur.

But South Korea didn’t publicize the latest test until Sunday, hours after North Korean state media published a brief report of the prior day’s launch. The flight data may suggest one reason for the immediate silence: The projectiles didn’t fly particularly far or high compared with the North’s other launches.