A post-mortem examination has been completed on the body of Kim Jong-nam, the brother of North Korean leader Kim Jong-un.
Mr Kim died on Monday after apparently being poisoned while waiting to board a flight in Kuala Lumpur, Malaysia.
One woman is due to appear in court on Thursday, and a second woman has now been arrested, police say.
There is widespread speculation that North Korea was behind the killing, but there has been no confirmation.
Malaysia has yet to formally confirm that the dead man, who was travelling under the name Kim Chol, is Kim Jong-nam, but South Korea says it is certain.
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