Attackers in north-eastern Nigeria have killed three South Korean doctors, beheading one in the assault, according to officials.
The attack happened last night in Potiskum, a town in Yobe state. Officials said that the doctors worked at the General Hospital in Potiskum.
A reporter saw the dead in the hospital morgue. One had been beheaded in the attack.
The three routinely travelled alone and without security guards in the city, which has been a repeated target of a radical Islamic sect known as Boko Haram.
A Nigerian police official confirmed the attack took place, but declined to immediately comment further.