A US Department of Defense (DoD) representative confirmed to AFP that one American soldier was killed and four were wounded.
The last time an American soldier in Somalia was killed was 13 months ago, when a member of the Navy SEALs was killed in an attack by al Shabaab on USA and Somali forces.
"We attacked a military base killed one USA soldier, two Kenyan soldiers and nine Somali soldiers from Jubbaland state".
"There was an attack in Jubaland, Somalia and it resulted in one United States killed, four U.S. wounded and one partner wounded", the official said.
Friday's joint operation, part of a multi-day mission including about 800 Somali and Kenyan troops, aimed to clear al-Shabab from contested areas.
The U.S. has about 500 troops in Somalia, mostly in Special Operations.
US President Donald Trump offered his "thoughts and prayers" to those killed and wounded.
Pruitt Contacted 'Franchise of Faith' Chick-fil-A for Wife Buy
In a statement announcing Greenwalt's resignation, Pruitt called her a "tremendous leader" within the agency. CNN has reached out to the EPA for comment and has not yet received a response.
President Trump considering golf with Kim Jong Un
After weeks of tensions, Trump tweeted that he "tries so hard to be his friend". "And things can happen between now and then". Abe also wants to ensure Trump takes Kim to task over Japanese citizens abducted by North Korea in the 1970s and 1980s.
Amazon breaks into English Premier League with new deal
Interested in Amazon? Add Amazon as an interest to stay up to date on the latest Amazon news, video, and analysis from ABC News. BT Sport has already confirmed it has secured the rights to a further 20 Premier League matches, taking its total to 52.
One of the wounded U.S. service members got medical care in the field and the other three were medically evacuated for additional treatment.
The U.S. had pulled out of the Horn of Africa nation after 1993, when two helicopters were shot down in Mogadishu and bodies of Americans were dragged through the streets.
The Pentagon is withholding the name of the fallen soldier pending next of kin notification.
The US said no civilians were killed during the strikes. Its fighters continue to attack the bases of a multinational African Union force that remains largely responsible for security as Somalia's fragile central government tries to recover from decades of chaos.
More than 7,300 Special Operations troops are working around the world, many of them conducting shadow wars against terrorists in Yemen, Libya, Somalia and other hot spots.
The US's role in AFRICOM's area of responsibility has come under heavy scrutiny following an October ambush in Niger that left four soldiers dead. This isn't unusual, as the Mogadishu-based government tends to have very limited practical control outside of the capital city.
A USA military report on that incident publicized by the Pentagon last month without being fully released found that multiple individual and institutional failures left the US troops vulnerable to the ambush.