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The Islamic State (IS) group has published a video purporting to show an ambush in Niger in which four US soldiers were killed last October.
It is not clear why the release of the video - via an IS outlet on messaging app Telegram - was delayed until now.
The video consists mainly of raw footage, including images apparently filmed using a helmet camera belonging to one of the soldiers.
The video seems to suggest that the attack was carried out by IS militants.
The deaths became a major talking point in the US when the widow of one of the soldiers, Army Sgt La David Johnson, said President Donald Trump had made her cry during a condolence phone call by suggesting her husband "knew what he signed up for".
The president later said Ms Wilson's account of the call was "totally fabricated" .
The propaganda film begins with still images showing an alleged pledge of allegiance to IS leader Abu Bakr al-Baghdadi by members of the Sahel-based group Jamaat Nusrat al-Islam wal-Muslimin (JNIM).
JNIM was formed from a number of West African jihadist groups in March 2017, and originally had pledged allegiance to al-Qaeda.
This alleged switch to IS was reported last month by a number of analysts, but it had not been promoted by IS outlets on social media.
The graphic video shows several armed militants walking and running in a desert area, apparently heading for the ambush, reports BBC Monitoring.
The soldiers are seen driving away in a white vehicle, with coloured smoke grenades providing cover.
After a cut in the video, the US soldiers are seen around another vehicle, with one soldier driving and the other two walking beside while seemingly firing at their attackers.
Then, one of the soldiers drops to the ground. The man wearing the helmet camera tries to raise the fallen man.
The soldier driving the vehicle jumps out and helps drag the soldier to cover, before he and the camera-wearer run into the scrub.
While running, the soldier wearing the camera falls to the ground. The footage ends with the camera unmoving, and militants surrounding the soldier, firing at point-blank range.
La David Johnson, one of the US soldiers killed in the attack
The deaths in Niger sparked controversy after President Donald Trump's phone call to the widow of Sgt La David Johnson.
Democratic congresswoman Frederica Wilson, who knew the soldier in question, heard the call while en route to meet his body with his family, and said the president did not seem to know his name.
President Trump denied forgetting Sgt Johnson's name in the call, saying he spoke it "without hesitation". He said it had been a "very nice conversation".
Sgt Johnson's body was initially located two days after the ambush, while the bodies of the other three soldiers were discovered on the same day they were attacked, on 4 October 2017.
The US has about 800 troops in Niger, to help train local forces and support counter-terrorism efforts there.
This was the first time US troops were killed in combat in Niger.
