North Korea marked the anniversary of the founding of its military Tuesday by conducting a huge, long-range artillery drill.
According to a report from South Korea's Yonhap news agency, the drill involved up to 400 artillery pieces and may have been supervised by the country's leader, Kim Jong-un.
Experts had originally thought North Korea would carry out a nuclear test or ballistic missile launch to celebrate the anniversary.
It's not uncommon for North Korea to use important national holidays to show off its military might.
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For example, April 15 marked the 105th birthday of the country's founder.
To commemorate the occasion, the North held a massive military parade to flaunt what are believed to be new intercontinental ballistic missiles.
And the very next morning, it launched a ballistic missile that quickly failed after liftoff.
In addition to Tuesday's military exercises in North Korea, navies from both South Korea and the U.S. held drills in the Yellow Sea.
