A view of a recent North Korea’s missile launch

North Korea twice fired unidentified projectiles into the Sea of Japan on Saturday, South Korea’s military said, the seventh such launch in less than a month.

The projectiles were launched in the morning from the eastern province of South Hamgyong, according to the Joint Chiefs of Staff.

“Our military is monitoring the situation in case of additional launches and maintaining a readiness posture,” the South Korean Joint Chiefs of Staff said, according to Yonhap News Agency.

Saturday’s test comes a week after the country’s previous weapons test, which saw two short-range ballistic missiles fired into the Sea of Japan, as it has done numerous times in recent months.

The most recent tests have been protest messages by Pyongyang against South Korean participation in war games with the US, but it’s unknown what Saturday’s test was in response to, if anything, Sputnik reported.