North Korea’s secret police met to discuss ongoing problems controlling “anti-socialist” acts and other internal security challenges at a five-day conference this week, according to state media on Friday.

The country’s leader Kim Jong Un reportedly sent a letter of instructions to the Fifth Conference of Security Officials held from Nov. 19 to 23, but the Korean Central News Agency (KCNA) did not publish the letter’s details or mention his presence at the event.

Overall, the KCNA reportwas brief and did not include photos, indicating authorities wish to keep most details of the event under wraps as its content