Police will apply for a remand extention of another seven days on three detained suspects to help investigations into the murder of North Korean national Kim Jong-nam on Feb 13, said Inspector-General of Police Tan Sri Khalid Abu Bakar.

He said the remand application would be made on a female suspect using a Vietnamese passport with the name Doan Thi Huong, 28, another female suspect, Siti Aishah, 25, who used an Indonesian passport and a North Korean man known as Ri Jong Chol, 47.

"A local (Malaysian) man Muhammad Farid Jalaluddin, 26, arrested earlier, was released on police bail," he told a media conference in Bukit Aman, here today.

Kim Jong-nam, the elder half-brother of North Korean leader Kim Jong-un, died on Feb 13 while on the way to the Putrajaya Hospital.

Earlier that day, Jong-nam was at the KL International Airport 2 (klia2) at about 8am, waiting for his flight to Macau, when a woman suddenly covered his face with a cloth laced with what is believed to be poison.

He had come to Malaysia on Feb 6 and carried a passport with the name of Kim Chol.

Following the case, four individuals were arrested by police in stages until yesterday.

-- BERNAMA