AGENCIES: Two North Korean fishermen suspected of killing 16 fellow crew members before fleeing to the South, have been handed back to the North.

They crossed the maritime border on Saturday and were later detained by authorities in the South.

South Korea usually grants asylum to defectors but said that in this case, the two men posed a threat to national security.

They were treated as criminals – rather than defectors – and sent back.

After crossing the border on their squid fishing boat, it took two days for the South Korean navy to seize them.

According to the Yonhap news agency, citing officials, the two confessed that they and another man killed the captain in late October because of his harsh treatment.

They then killed the other protesting crew members, one by one. The bodies were dumped overboard.

The three suspects initially returned to the North – but when one of them was captured by local police at a port, the other two decided to flee on their boat to the South.