Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US Military Probes Twitter Post Claiming to Show US Troops Killed in Niger by Carla Babb PENTAGON -- The U.S. military is reviewing images posted on the social media site Twitter that claim to show dead American soldiers killed during an ambush in Niger last year. U.S. Africa Command (AFRICOM) said Wednesday it is "aware of the post on Twitter" and is reviewing it to determine "the veracity of the tweet and the assertions that there is an associated video." The post says the images are from a more than 10-minute-long video broadcast by an affiliate of the Islamic State in Mali. The post adds that the video shows a wounded American soldier and the bodies of the three other U.S. soldiers who were killed in the October 4 ambush. The militant attack near the village of Tongo Tongo killed four American soldiers, four Nigerian soldiers and a Nigerian interpreter. A formal investigation into the deadly ambush in Niger is expected to be completed by the end of this month. A group of 12 members of a U.S. Special Operations Task Force accompanied 30 Nigerian forces on a reconnaissance mission from the capital city of Niamey to an area near Tongo Tongo. Members of the team had just completed a meeting with local leaders and were walking back to their vehicles when they were attacked, U.S. officials told VOA. Some 1,300 U.S. military personnel work in the Lake Chad Basin -- Niger, Nigeria, Cameroon and Chad -- to help strengthen local militaries and counter Boko Haram, al-Qaida, IS and other extremist groups. Carla is VOA's Pentagon correspondent covering defense and international security issues. Her datelines include Ukraine, Turkey, Pakistan, Afghanistan, Iraq and Korea.