North Korea fired a short range missile into the East Sea on Friday afternoon, South Korean military sources told local media, the second reported launch of a projectile to occur this week alone.

The missile, which was fired from near Sondok airfield, Hamgyongnamdo, was reported to be a ballistic type, an anonymous military source told ROK national news agency Yonhap.

“Military authorities are investigating the event to identify where it was launched and what kind of missile it is,” the report said. However, the AP news agency said it was unable to confirm the launch from South Korea’s Defense Ministry.

Map shows Sondok airfield, located in