David Cameron visits a memorial to a 1919 massacre in the Indian city of Amritsar . Cameron : `` We must never forget what happened here '' and we will not let it happen again. Hundreds of people were killed when British troops opened fire on unarmed protesters .
David Cameron visits a memorial to a 1919 massacre in the Indian city of Amritsar . Cameron : `` We must never forget what happened here '' British prime minister stops short of a formal apology for the colonial-era massacre . Hundreds of people were killed when British troops opened fire on unarmed protesters .