An Indonesian woman held over the killing of Kim Jong-un's half-brother thought she was taking part in a TV prank, police say.
Kim Jong-nam is thought to have been poisoned as he waited to board a flight in Kuala Lumpur on Monday.
Two women and a man were arrested over the death.
Indonesia's national police chief said one of the women, named as Siti Aisyah, claimed to have been paid to perform what she thought was a prank.
Police believe a poisonous substance was sprayed into Kim Jong-nam's face.
Tito Karnavian, Indonesia's most senior policeman, said the two women had already performed the prank on other men. It involved convincing the men to close their eyes before spraying them with water.
"Such an action was done three or four times and they were given a few dollars for it, and with the last target, Kim Jong-nam, allegedly there were dangerous materials in the sprayer," Mr Karnavian told reporters.
"She was not aware that it was an assassination attempt by alleged foreign agents."
A grainy image broadcast in South Korea and Malaysia showed a woman running in the airport, wearing a white T-shirt with the letters "LOL" written on the front.