South Korea's military says North Korea may have launched two ballistic missiles on Wednesday.
The South Korean officials say they were launched from a central area of North Korea in the direction of the Sea of Japan.
Meanwhile, the Japan Coast Guard says the two projectiles seem to have fallen into the ocean outside Japan's exclusive economic zone.
Japan's Prime Minister Suga Yoshihide said, "The action is threatening the peace and security of our country and the region. They are also violating UN Security Council resolutions. We will strongly protest and condemn the launches. We will do our utmost to analyze the information and provide it to people swiftly and accurately."
North Korea most recently launched ballistic missiles in March.
On Monday, the country said it had launched a new type of long-range cruise missile.