KUALA LUMPUR, MALAYSIA—Malaysia’s police chief says the two female suspects in the killing of North Korean leader Kim Jong Un’s half brother at Kuala Lumpur’s airport were trained to wipe toxin on his face, then wash their hands.

Inspector-General of Police Khalid Abu Bakar said Wednesday that North Koreans placed the toxin on the hands of the two women, one Indonesian and one Vietnamese. He was the North Korean suspect who gave them the toxin is in custody and Malaysian authorities are seeking seven others, including two Khalid announced Wednesday.

He said four of the North Korean suspects fled to their home country but three others were believed to still be in Malaysia, including an embassy worker and an employee of state airline Air Koryo.

Khalid referred to the victim, Kim Jong Nam, as Kim Chol, the name on his passport.

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