North Korea launched several short-range projectiles into the sea from its east coast Thursday morning, South Korean media reported, citing military sources.

The North Korean military fired six projectiles about 100-150 kilometers into the Sea of Japan (known in Korea as the East Sea) from somewhere near the east coast port city of Wonsan at around 10 am Thursday morning, South Korea time.

It is not yet known what type of projectile was fired, but it was likely either some type short-range ballistic missile – such as Scuds or Rodongs – or artillery rockets from a multiple rocket launcher