A leader of Somalia's al Qaeda-linked militants Ahmed Abdi Godane was the target of an US air strike in Somalia, an US official said.
It is not clear whether the Al-Shabaab leader was hit in the strike, the official added.
Six militants were killed in the attack on two vehicles that were heading toward the coastal town of Barawe, Al-Shabab's main base.
Since taking charge in 2008, Godane has restyled the group as a global al Qaeda player - a transformation that was highlighted when it killed at least 67 people in an attack on a Kenyan shopping mall last September.
More top news
Kittens have been rescued from an incinerator plant in Birmingham.
A British man trying to return home from fighting in Syria has said the new terror laws are forcing him to stay as a fighter.
A reporter was blindsided by an errant skateboard which smacked him squarely in the back of the head while shooting a piece to camera.