KUALA LUMPUR, Feb. 23 (Xinhua) -- Malaysian police have sent a formal request to the embassy of the Democratic Peoples's Republic of Korea (DPRK) to interview a second secretary believed to be involved in the death of a DPRK man, said Malaysian police chief on Thursday.

"We have sent our request letter through the proper channel, that is the foreign affairs ministry, and from the ministry to the embassy," the police chief Khalid Abu Bakar told reporters when asked about how to secure the cooperation of a foreign diplomat, who is entitled to diplomatic immunity.

He said Malaysia has followed the protocol and rules pertaining to foreign expatriates.

He added that Malaysia has applied to the International Criminal Police Organization, or the Interpol to help nab the four DPRK suspects who have fled the country.

He also noted that Malaysia did not send any samples (of the deceased) anywhere, nor did it receive any DNA samples from any country.