An Indonesian woman suspected of the murder of the half-brother of North Korea's leader, says she was paid the equivalent of 125 dollars.

The 25 year-old insists it was a prank, for a TV reality show.

Meanwhile, Malaysian police say they'll sweep the airport at Kuala Lumpur for any sign of VX nerve gas, which is believed to have been used.

Korea analyst Sue Mi Kelly said the assassination reveals how bold Kim Jong Un has become.

"I believe that he's more willing to take risks than even his father. I would like to believe that there is a red line, such as maybe selling nuclear fission material to terrorist groups."