U.S. forces were offering "advice, assistance and aerial surveillance during the mission", U.S. Africa Command said, noting that the mission was created to increase the Somali government's ability to provide services to innocent civilians under al-Shabab rule.
The multinational force "came under mortar and small-arms fire at approximately 2:45pm Mogadishu time [11:45 GMT], killing one United States service member and injuring four USA service members and one partner force member", the U.S. military's Africa Command said in a statement.
But U.S. military leaders later acknowledged that the Navy SEALs were operating alongside the Somali military when they launched the raid.
Friday's joint operation was part of a multi-day mission including about 800 Somali and Kenyan troops.
The U.S. Africa Command reported killing 27 al-Shabaab terrorists Saturday, and in 2014 the U.S. said it killed the group's leader Ahmed Abdi Godane in a drone strike. The operation aimed to clear the Somalia-based extremist group al-Shabab from contested areas.
Justify wins Belmont Stakes to become 13th Triple Crown victor
Darren Rogers, spokesman for Churchill Downs , tweeted after the Belmont that Justify would return there on Monday afternoon. He triumphed at the Grade 1 Santa Anita Derby on April 7, earning him enough points to qualify for the Kentucky Derby .
Islamist group al Shabaab has claimed responsibility for the gun and mortar attack yesterday afternoon.
Another U.S. service member in Somalia was killed in May 2017 during an operation about 40 miles (64 kilometers) west of Mogadishu.
That death was followed by an ugly confrontation between President Donald Trump, members of his staff and the widow of one of the soldiers killed.
Although one of the wounded Americans did not receive additional care after being treated in the field, the other three and the wounded local soldier were medically evacuated for follow-up care.
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Al-Shabab was forced out of the capital, Mogadishu, in August 2011 following an offensive spearheaded by African Union (AU) troops, and left the vital port of Kismayo in September 2012. Though the Pentagon initially described Miliken as operating behind Somali troops, US officials later acknowledged that USA special operations soldiers had been fighting together with the Somali forces. The US had pulled out of the country after 1993, when two helicopters were shot down in Mogadishu and bodies of Americans were dragged through the streets. Since 2007, Al-Shabaab has been fighting to overthrow the internationally backed government in Somalia.
The Pentagon is withholding the name of the fallen soldier pending next of kin notification.
The casualty, coming less than a year after the death in Niger of four Army special operations soldiers, could raise further questions about the presence of USA troops on remote missions in Africa.
The investigation has already triggered changes in the way military activities are carried out in Niger and elsewhere in Africa, including giving teams the option to use heavily armored vehicles and beefed-up firepower.
Republican Sen. John Kennedy: EPA Administrator Scott Pruitt 'acting like a moron'
Earlier this week, EPA's director of scheduling and advance, Millan Hupp, gave notice of her departure; her last day is Friday. Joni Ernst, a staunchly conservative Republican from Iowa, suggested Pruitt should resign.