South Korean police on Tuesday arrested a pastor who is under investigation for allegedly sexually assaulting North Korean defector children, according to investigators.

Park Dae-gang, chief of Seoul Metropolitan Police Agency’s Women and Juvenile Investigation Division, confirmed to NK News that the man surnamed Chun is in police custody, while declining to state the reasons for the arrest.

But law enforcement previously confirmed its probe into Chun in early August, when allegations that the pastor molested the victims at his school for DPRK escapees surfaced in South Korean media.

Police told NK Newsat the time that Chun was