The police feel it is still too early to conclude that foreign special agents had killed Kim Jong-nam, the elder half-brother of North Korean leader Kim Jong-un, in Malaysia on Monday.

Bukit Aman Special Branch director Datuk Seri Mohamad Fuzi Harun said the investigation was going on and the case was complicated.

He declined further comment when asked about the arrests of two women holding foreign passports and a Malaysian man over the killing.

Bernama had asked Mohamad Fuzi about the possibility of foreign special agents having been involved.

Two women, one aged 29 holding a Vietnamese passport bearing the name Doan Thi Huong, and the other aged 25 with an Indonesian passport having the name Siti Aishah, and a 26-year-old Malaysian man believed to be the boyfriend of Siti Aishah have been arrested following the killing of Jong-nam.

Deputy Inspector-General of Police Tan Sri Noor Rashid Ibrahim had said that more arrests were expected.

It is learnt that the police are looking for four men to assist in the investigation.

Last Monday, Jong-nam was at the KL International Airport 2 at 8am to board a flight to Macau an hour later when a woman suddenly covered his face with a cloth laced with what is believed to be poison.

Jong-nam, who had used a passport bearing the name of Kim Chol, sought help at a customer service counter at klia2 and was rushed to the Putrajaya Hospital but died on the way.

-- BERNAMA