A man claiming to be the son of the slain, estranged half-brother of North Korea’s leader said he was lying low with his mother and sister, in a video posted online by a group that said it helped rescue them following the murder a month ago.

The governments of the Netherlands, China, the United States, and a fourth unnamed country provided emergency humanitarian assistance to protect the family, the group, called Cheollima Civil Defense, said in a statement released on Wednesday along with the video.

An official at South Korea’s National Intelligence Service said the man in the video is Kim Han Sol, the 21-year-old son of Kim Jong Nam, who was killed at Kuala Lumpur International Airport on Feb. 13 by assassins who Malaysian police say used a super-toxic nerve agent.

The intelligence official declined to go beyond identifying Kim Han Sol. During the 40-second video posted on Wednesday, the man says his father was killed a few days ago.

Reuters Kim Han Sol's father, Kim Jong Nam, was killed at Kuala Lumpur International Airport on Feb. 13 by assassins.

“I’m currently with my mother and my sister...,” he said, speaking in English, without disclosing his location or who he was living with.

“We hope this gets better soon,” he added.

Reuters could not independently verify the video. But the man closely resembled Kim Han Sol, who was last interviewed on camera in 2012 by former Finnish defense minister Elisabeth Rehn.

Kim Han Sol is the son of Kim Jong Nam’s second wife, who had been living in the Chinese territory of Macau with Kim under Beijing’s protection after the family went into exile several years ago.

South Korean intelligence officers say North Korean leader Kim Jong Un had issued standing orders for the elimination of his elder half-brother.

The statement released on the website of Cheollima Civil Defense said the organization responded last month to an emergency request by Kim Jong Nam’s family members for “extraction and protection”.

JUNG YEON-JE via Getty Images South Koreans watch a video on the news Wednesday that shows a man claiming to be the son of Kim Jong Un's elder half-brother, who had been estranged.

It is not clear who is behind the group, which says it can help high-level North Koreans escape the isolated country and hides its digital footprint.

The website on which the statement and video was posted was registered on Saturday, according to WHOIS database records, which disclose website ownership.

The WHOIS database shows the group used a Panama-based protection service to hide ownership of its website address.

The authors of the statement encouraged people to join their organization by writing to an email address hosted by a Switzerland-based encrypted email service, and they requested donations via the digital Bitcoin currency.

The group thanked the Netherlands ambassador to North and South Korea, Lody Embrechts, for his “timely and strong response” to the group’s request for help.

Embrechts, who is based in South Korea, declined to comment on the statement, as did the Dutch Ministry of Foreign Affairs.

“We are aware of these reports. The MFA cannot comment on them,” a spokeswoman said.

“The three family members were met quickly and relocated to safety. We have in the past addressed other urgent needs for protection,” the Cheollima Civil Defense statement said, adding that the whereabouts of the family will not be addressed.

“Cheollima” is the name given to a mythical horse in Chinese and Korean folklore, said to be able to travel over great distances.

The term is used in North Korean propaganda to symbolize rapid economic development, as well as to name streets, restaurants and other domestic brands.

In the video, Kim held up a black North Korean service passport in the video and opened it. The details were edited out, but a North Korean state stamp is visible on one page, as is a line of English text which said the passport’s validity had been extended.

North Korean service passports are issued to government officials. They are black and embossed with gold text which says “PASSPORT (FOR OFFICIAL TRIP)”.

South Korean intelligence and U.S. officials say Kim Jong Nam’s murder was an assassination organized by North Korean agents.

Malaysian police have identified eight North Koreans wanted for questioning in the case, but the only people charged with the murder so far are an Indonesian woman and a Vietnamese woman who police say wiped the VX nerve agent on the victim’s face.

Malaysia is still waiting for DNA samples of the next of kin to officially verify the identity, but no family member has made contact yet.

The Southeast Asian country has said it would only release Kim’s body to the next of kin, refusing demands from North Korea to hand over the body without an autopsy.

For a graphic on North Korea’s family tree, click here

(Additional reporting by Ju-min Park in SEOUL and Thomas Escritt in AMSTERDAM; Writing by Praveen Menon; Editing by Simon Cameron-Moore, Bill Tarrant and Mike Collett-White)