Witnesses said the attack took place near the town of Sanguni, while the us and Somali troops were digging trenches and setting up other defenses.
An American special operations soldier was killed on Friday in an attack in southern Somalia that also wounded four USA military personnel along with a Somali soldier, a USA defence official told AFP.
The U.S. special operations forces were fighting alongside about 800 troops from the Somali National Security Forces and Kenyan Defence Forces when they were targeted around 2.45pm local time.
Trump's tweet came just a few hours after the military officially reported the Special Operations agent's death, stating that one other service member had been wounded in an enemy attack.
Al-Shabab said it stormed a Somali military base near Bosaso in the country's northeast, blew up a USA military vehicle and downed a US surveillance drone.
The coalition force was conducting a "multi-day operation" to clear al-Shabaab, an Islamist militant group, from nearby villages. There are now 500 troops stationed in Somalia fighting Islamic terrorism, but there could be more due to shadow wars.
Local al-Qaeda affiliate al-Shabaab has claimed responsibility for the attack.
Amid tensions, all G-7 members sign statement
Trump himself told reporters on Saturday that the summit was not contentious and called his relationship with G7 allies a "10". Donilon also criticized Trump for isolating the United States at a summit where it used to be the leader.
Associated Press video on Friday showed Somali forces firing weapons from atop pickup trucks in a muddy rural area, and an unidentified US soldier speaking with local residents.
A U.S. Africa Command statement says the four wounded are now in the care of the U.S. Embassy medical team in neighboring Kenya. 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. Al-Shabab has been blamed for the October truck bombing in Mogadishu that killed more than 500 people.
Hundreds of newly trained al-Shabab fighters perform military exercises in the Lafofe area south of Mogadishu, Somalia, on February 17, 2011. Names of the soldiers were not immediately released, while next of kin were notified.
A US Special Forces Operational Detachment Alpha (ODA) came under attack today in the Bar-Sanguni area near Kismayo in Somalia.
It was also a 3rd Special Forces Group team which was hit in Niger a year ago, an ambush which killed four American soldiers and led to a massive investigation by the Pentagon. A Pentagon investigation of the incident produced a highly critical report.
Marine Corps Gen. Thomas D. Waldhauser, who heads U.S. Africa Command, said at a Pentagon press conference that he had taken steps to better ensure the safety of U.S. service members in future operations.
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