Witnesses say unidentified helicopter gunships have attacked a Somali town controlled by al-Shabab militants.
Residents of Marka, south of Mogadishu, say the gunships fired on houses of al-Shabab commanders Sunday. They say the helicopter flew away after Islamist forces fired back at it.
There have been no immediate reports of casualties and no claim of responsibility.
An al-Shabab commander, Salah Ali Salah Nabhan, was killed in a U.S. helicopter strike in the town of Barawe last year.
Al-Shabab controls much of southern and central Somalia, including parts of the capital. The group is attempting to overthrow the Somali government and to turn Somalia into a strict Islamic state.