A seven-year-old boy swims 21 miles to help other children.
Joseph Purcell decided to act after seeing television pictures from war-torn Syria.
So the youngster, who is from Wokingham, persuaded sponsors to back him as he tackled a distance equivalent to the English Channel.
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A man said to be armed with dangerous articles remains inside an address in west London.
Police have begun a murder investigation following the stabbing of a 28-year-old in Shepherd's Bush,west London.
Armed police have been called to a property in Northolt following reports of a man with hazardous items inside.