Two North Korean defector-run groups targeted for legal action by South Korean authorities say they intend to continue sending propaganda leaflets and humanitarian aid into North Korea, despite criticism from governments in both countries.

South Korea, which is trying to improve ties with the North, on Wednesday accused the two groups, Kuensaem Education Center and Fighters for a Free North Korea, of violating the Inter-Korean Exchange and Co-operation Act by sending leaflets and aid such as rice and medicine.

On Thursday, the South's Unification Ministry said it had asked Seoul police to investigate the groups.