Security teams in protective suits had earlier swept the area.
Malaysia's health minister said that an autopsy suggested the toxin used to kill Kim Jong-nam caused "very serious paralysis".
Tests show Mr Kim was killed with the highly toxic nerve agent VX.
An Indonesian woman arrested for the murder has said she was given 400 Malaysian ringgit ($90; £72) to carry out a prank.
Siti Aisyah, 25, told Indonesian embassy officials that she was given the cash to smear Kim Jong-nam's face with "baby oil" as part of a reality show joke.
