But U.S. military leaders later acknowledged that the Navy SEALs were operating alongside the Somali military when they launched the raid.
A U.S. special operations soldier has been killed and five military personnel - including four American service members - wounded in an "enemy attack" in southwestern Somalia, according to United States officials.
According to the U.S. Africa Command, U.S. service members were with Somali forces in an operation aimed at clearing al-Shabab, a terrorist organization, from villages and establishing a permanent combat outpost.
Last year, a member of the Navy SEALs was killed in a nighttime attack in Somalia, marking the first USA military combat death there since the infamous events of "Black Hawk Down" in 1993, when 18 American servicemen died in what is called the Battle of Mogadishu.
"My thoughts and prayers are with the families of our serviceman who was killed and his fellow servicemen who were wounded in Somolia (sic)", he tweeted.
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Associated Press video on Friday showed Somali forces firing weapons from atop pickup trucks in a muddy rural area, and an unidentified USA soldier speaking with local residents. It was pushed out of Mogadishu in recent years but continues to control rural areas in the south and central regions.
Around 500 American forces are stationed throughout Somalia including a number of Special Operations units comprised Army Green Berets, Marine Raiders and Navy SEALS.
But Mr Trump approved expanded military operations against al-Shabab in early 2017, leading to an increase in USA military personnel to more than 500 and the launch of dozens of drone strikes.
A US Special Forces Operational Detachment Alpha (ODA) came under attack today in the Bar-Sanguni area near Kismayo in Somalia. One coalition service member was wounded.
The Pentagon didn't identify the USA commando who was killed, pending notification of next of kin.