Malaysian police say they are seeking a senior official at the North Korean embassy in Kuala Lumpur in connection with the killing of Kim Jong-nam.
Kim, the half-brother of North Korean leader Kim Jong-un, died on 13 February at Kuala Lumpur airport.
Police also confirmed details of the killing, saying two women approached him and wiped a toxin on his face.
There is widespread suspicion North Korea was behind the attack, which its envoy in Malaysia has angrily denied.
Speaking at a news conference in Kuala Lumpur, Malaysian Police Chief Khalid Abu Bakar said three North Korean suspects were being sought, in addition to the previously announced suspects, and were believed to still be in the country.
One is the second secretary of the North Korean Embassy in Kuala Lumpur, whom he named as Hyon Kwang song.
The other two are Kim Uk Il, a staff member of north Korea’s state airline air Koryo, and Ri Ji U.
He added that the other four North Korean suspects are believed to have fled Malaysia to Pyongyang, while one North Korean man, Ri Jong Chol, remains in Malaysian police custody.
Two women – Indonesian citizen Siti Aisyah and Vietnamese national Doan Thi Huong – are also in custody.