Kim Jong-nam
VX nerve agent is chemical weapon classified as a weapon of mass destruction by the United Nations.
A Vietnamese woman, an Indonesian woman and a North Korean man have been “arrested unreasonably,” the embassy said.
The slaying has triggered a diplomatic row between Malaysia and North Korea.
The estranged half-brother of North Korean leader Kim Jong Un died this week after being assaulted at Kuala Lumpur International Airport.
WHAT'S HAPPENING
He is the boyfriend of the second suspect.
Kim Jong Nam reportedly wrote a letter to his brother asking him to withdraw a standing order for his assassination.
Kim Jong Nam was assaulted on Monday morning in Kuala Lumpur International Airport and died on the way to hospital.
Lawmakers said the young, unpredictable North Korean leader had issued a “standing order” for his half-brother’s assassination.
Kim Jong Nam was poisoned by two women at Kuala Lumpur airport, a South Korean TV network reported.