Balloon launches to North Korea have been stopped under South Korea’s National Security Law, a religious group that regularly sends bibles to the North told NK News on Tuesday.

Staff from the Voice of the Martyrs Korea found themselves barricaded at their Mapo office for disagreeing with a police order to stop balloon launches to North Korea, as the final day of marathon talks between Seoul and Pyongyang were finishing up on Monday.

“Last week, Mapo police department called us and requested not to launch the balloons this week, saying that our activities could be a security threat against South Korean citizens,” Pastor Eric Foley, a spokesperson for the Voice