Jeremy Hughes, a firefighter from Morley, was running the marathon and had travelled with his wife and son. He spoke to us a short time ago and said had his wife not asked him to change meeting places, he would have been at the finishing line when the explosion went off.
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A dog that went missing for four days survived and was found - after dragging himself to safety when his leg was cut off by a train.
Poppies installed at the Tower of London to commemorate WWI last year have now been used in a sculpture at Yorkshire Sculpture Park.