LONDON - British officials say five soldiers have been killed on patrol in Afghanistan.

Friday's fresh casualties mean 15 British soldiers have been killed in the last 10 days as fighting in Helmand Province intensifies.

Three other combat deaths were announced earlier Friday, making it one of the worst days for British forces since the war began seven years ago.

Officials say families of the dead soldiers have been notified. Their names have not been released.

Prime Minister Gordon Brown says British forces face a difficult summer but will persevere.