A soldier has been killed in a grenade attack in Afghanistan, the Ministry of Defence has said.
Four UK troops have been killed in Afghanistan in the last week
The soldier, from 29 Commando Regiment Royal Artillery, died from his injuries after the attack on a British base in Sangin, in Helmand province.
Four British soldiers and marines have been killed in the province in less than a week as fighting intensifies.
His death brings to 52 the total number of UK troops to die while serving in Afghanistan since 2001.
The soldier was among 4,500 troops involved in Operation Achilles, as fighting intensifies in the province.
He died in hospital at British base Camp Bastion from injuries sustained when the grenade was fired at the base.
The MoD said his next of kin have been informed and have requested a period of grace before further details are released.
UK Task Force commander Brigadier Jerry Thomas said: "Regrettably I must report a further death today.
"At this very difficult time our thoughts are with his family, friends and colleagues and I want to convey my sincere and heartfelt condolences to them."