A British soldier was killed in an explosion in southern Afghanistan, the Ministry of Defence said.
The serviceman was a Royal Marine with 45 Commando, according to the MoD. Next of kin have been informed.
The marine's death took the number of British service personnel killed in Afghanistan since the start of operations in October 2001 to 126.
The MoD said: "It is with great sadness that the Ministry of Defence must confirm that a Royal Marine from 45 Commando Royal Marines was killed as a result of an explosion in the Kajaki area of Helmand Province.
"He was taking part in a patrol at the time. He received medical treatment at the scene; however, he unfortunately died of his wounds while being taken to the military hospital at Camp Bastion."
Commander Paula Rowe, from Task Force Helmand, said: "The tragic death of this Royal Marine has left everyone in Task Force Helmand immensely saddened. Our thoughts and prayers are with his family and friends at this dreadful time."
Next of kin have been informed and have asked for a 24-hour period of grace before further details are released.
ISA spokesman Brigadier General Richard Blanchette said: "Our sincere condolences and sympathies are with the family and friends of the brave serviceman who died.
"This man died serving his country and the people of Afghanistan; he died a hero."
