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Malaysia has recalled its envoy to Pyongyang in an escalating row over the killing of Kim Jong-nam, the half-brother of North Korea's leader Kim Jong-un.
Kim Jong-nam died in mysterious circumstances last week at a Kuala Lumpur airport - police believe he was poisoned while waiting for a flight.
Malaysian police say they are now looking for four North Koreans.
Pyongyang's envoy to Malaysia was also summoned over earlier comments he made.
Despite widespread speculation that North Korea was behind the killing, there has been no definitive evidence and Pyongyang has not issued an official statement on the issue so far.
South Korea has publically accused the North of orchestrating the incident, saying on Monday that it was evidence of North Korean "terrorism getting bolder".
Meanwhile a video which apparently shows CCTV footage of the attack on Kim Jong-Nam has surfaced and aired on Japanese television.
Malaysia was one of very few countries to maintain diplomatic relations with North Korea, but this killing has strained ties.
Over the past week Malaysia has refused to accede to North Korean demands to release Kim's body into their custody without an autopsy.
It prompted Pyongyang's ambassador to Malaysia, Kang Chol, to accuse Kuala Lumpur on Friday of colluding with "hostile forces", saying that Malaysia had "something to conceal".
This provoked an angry response from the Malaysian foreign ministry which said his accusation was "baseless", adding that it was their responsibility to conduct an investigation as Kim had died on Malaysian soil.
What's happening to Kim's body?Malaysian authorities are now waiting for the results of its autopsy. Kang Chol said his country would reject the result as it was done without their presence.
Malaysia has also refused to release Kim's body, saying it needs to conduct DNA testing first. Police are now seeking samples from family members.
Kim is believed to have family living in Beijing and Macau.
"If there is no claim by next of kin and upon exhausting all avenues (to obtain DNA), we will finally then hand over the body to the (North Korean) embassy," Abdul Samah Mat, a senior Malaysian police official told the Associated Press news agency.
Who has been arrested so far?Malaysian police have detained one North Korean suspect, Ri Jong-chol, and said they are looking for four more men, who may have already left the country.
The men have been named as Ri Ji Hyon, 33; Hong Song Hac, 34; O Jong Gil, 55, and Ri Jae Nam, 57.
Two women, an Indonesian and a Vietnamese, have also been arrested.
The Indonesian, named as Siti Aisyah, is said to have told Malaysian police she had been paid to perform what she thought was a prank.
Kim is believed to have been attacked in the Kuala Lumpur airport departure hall on Monday by the two women, using some form of chemical.
Fuji TV has aired grainy CCTV footage showing a man resembling Kim Jong-nam approached by a woman at the airport.
Another woman then quickly lunges from behind and wipes his face with a cloth. She is seen wearing a white top emblazoned with the letters "LOL", similar to one said to have been worn by Vietnamese suspect Doan Thi Huong.
The man is then seen seeking assistance from airport staff while gesturing at his face, and is escorted to a room.