U.S. military forces conducted an operation on Monday against the Al-Shabaab terrorist network in Somalia, Pentagon press secretary Rear Adm. John Kirby said, according to CNN.
"We are assessing the results of the operation and will provide additional information as and when appropriate," he said.
No other information was immediately available.
The United States designated Al-Shabaab, an Al-Qaeda-linked terrorist group, as a foreign terrorist organization in March 2008.
Al-Shabaab has carried out various terrorist attacks, including a deadly attack at a shopping mall in Nairobi, Kenya, last September. Kenya has faced multiple attacks by Al-Shabaab terrorists, who want the country's military to leave Somalia.
In January, the U.S. military carried out a missile strike in southern Somalia to target a senior figure in Al-Shabaab.
It was unclear at the time if the raid, in which witnesses said a vehicle was struck, was successful.
Last October, a U.S. military strike hit a vehicle carrying senior members of the group, killing its top explosives expert.
Earlier that month, U.S. Navy SEALs raided a coastal Somali town to take down a Kenyan Al Shabaab member.
The SEALs withdrew before capturing or killing their target — Abdulkadir Mohamed Abdulkadir, known as Ikrima — who was identified as the lead planner of a plot by Al-Shabaab to attack Kenya's parliament building and the United Nations office in capital, Nairobi, in 2011 and 2012.