The US has carried out a commando raid on an al-Qaeda stronghold in central Yemen, killing 14 militants, the BBC quoted the US military as saying in Sunday.
One US soldier died and three were injured.
Several Apache helicopters were reported to have taken part in the operation in al-Baida province.
Three al-Qaeda leaders were among those killed in a battle lasting 45 minutes in a village in Yakla district. Earlier reports suggested a higher death toll.
US drones have carried out periodic attacks on al-Qaeda in Yemen.
Local sources earlier said 41 militants and 16 civilians were killed.
A provincial official said the helicopters targeted a hospital, school and mosque.
Leading al-Qaeda figure Abdul Raouf al-Dhahab was among those killed in the night-time operation in which drones were also used.
Al-Qaeda has taken advantage of the chaos caused by the conflict in Yemen to entrench its presence in the south and south-east.