Inspector-general of police Khalid Abu Bakar has denied that the next-of-kin of murdered Kim Jong-nam would arrive in the next few days.

The top cop said his deputy Noor Rashid Ibrahim had been misquoted by the media.

"No, not true. Don't listen to rumours. Please do not be a rumour monger," he told the media at KLIA before leaving for a minor pilgrimage (umrah) for ten days.

The North Korean embassy, which was informed by the Malaysian police to ask the next-of-kin to come and provide DNA sample for the process of identification, has yet to respond to the police on this matter, Khalid said.

He reiterated that Malaysia will not send people to Macau for that purpose, brushing off speculation that Malaysia has contacted the China government or that it was planning to do so.

To a question if the suspects would be prosecuted in Malaysia, he said it is too early to tell as the investigation was still going on.

Khalid further declined to conclude there was a sinister plan to assassinate Jong-nam following the revelation that lethal chemicals was used in the case and the video clips related to his murder.

He said he had no idea where the VX nerve chemical that was used, came from.

"If the chemical content was brought (into the country) in small amounts, it's hard for us to detect (the origin of the chemical)," he said.

The police will also determine the motive behind the death of Jong-nam, the half-brother of North Korea's leader Kim Jung-un, Khalid added.

He revealed that one of the two women suspects had also suffered the effect of the poison, which caused her to vomit.

North Korean ambassador Kang Chol had accused Malaysia of colluding with South Korea, claiming the female suspect from Vietnam would have died if she had poisoned Jong-nam.

When asked whether the public should avoid KLIA2 due to the radioactive residue, Khalid said he wasn't sure.

"I don't know, I am not the expert. We will get the relevant atomic energy expert to go to the location to see if radioactive (material) is still there," he responded.

"We are making the arrangement with the atomic energy authority to sweep all locations we know the suspects went to. We are concerned and looking into that," he said.

Jong-nam died on Feb 13 after falling ill at KLIA2 on his way to catch a flight to Macau and police determined that a toxic chemical wiped on his face had caused his death.

A CCTV footage leaked from the airport showed how he was approached by a female suspect before he complained of being ill.