In an interview with ITV News, General Sir David Richards defended the British Army's record in Afghanistan.
"What our soldiers and those who sacrificed their lives and their families can be reassured by is that our actions since 2001 have ensured that no terrorist atrocity has been planned or executed from Afghan soil," he said.
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Tony Davis was the first civilian to reach Pc Palmer after he was stabbed during the Westminster attack.
Defiant Londoners put on a show of solidarity for the victims of the Westminster terror attack at a vigil in their honour.