SEOUL, March 5 (Yonhap) — North Korea’s state radio station resumed broadcasting mysterious numbers Sunday that could be some kind of coded message to its agents operating in South Korea.

The message began just after midnight (Seoul time), at 12:15 a.m., by the North’s propaganda station Radio Pyongyang. It lasted a few minutes with the message being repeated twice. The last encrypted message sent by the North was detected on Feb. 19 with this being the seventh of its kind this year.

The announcer addressed the “21st exploration team” and said it is calling for a review of a math assignment. “On page 924 number 49, on page 14 number 76, on page 418 number 37,” the radio station broadcast, followed by more numbers. The latest batch of numbers are completely different from the content aired last month.

It marked the 27th time that Pyongyang has broadcast encrypted numbers since June 2016.

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