Local South Korean authorities escalated their crackdown on anti-regime leafleting into North Korea on Tuesday, referring a prominent defector-activist to prosecutors for allegedly violating the country’s Aviation Safety Act.

The Northern Gyeonggi Provincial Police Agency told NK News that it referred Park Sang-hak, head of Fighters for a Free North Korea (FFNK), without detention for launching balloons carrying anti-DPRK leaflets northward earlier this year.

Police allege that Park launched9-10 large balloons from the border city of Paju on June 20. The balloons carried approximately 300,000 leaflets, USB drives and U.S. dollar bills, according to authorities, and each balloon reportedly