BOSTON BOMBING AFTERMATH - 17TH APRIL

At least three people have been killed and more than 100 injured, some seriously, in two explosions at the finish line of the Boston Marathon. TV footage showed bloodied runners and spectators being treated at the scene and the road strewn with debris. The FBI said that this was a "potential terrorist

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KRYPONITE BEACH

LUMINOUS green rocks could easily be a beach from Superman's homeland of Krypton .

HEAVY RAIN AND WILD WEATHER FOR SOUTHERN ENGLAND AND WALES

Southern England, the south-west and west Wales have been warned to expect more wild weather, with heavy rain and high tides possibly leading to coastal flooding and travel disruption over the weekend .

SPECTACULAR AURORA BOREALIS

A SPECTRUM of colours fills the sky during this spectacular and natural display of light .

SWIMMING WITH WHALE SHARKS

A diver looks like a minnow as she swims alongside a gigantic whale shark, the largest species of fish on the planet .

SHIVERING SQUIRREL

THIS LITTLE squirrel tries to keep himself snug as snow starts to fall around him .

HUNGRY HERON STRUGGLES TO HOLD ONTO ITS CATCH

A DETERMINED great blue heron holds on tightly to its prey as the furry gopher attempts to wriggle free .

STUNNING WINTER PHOTOGRAPHS OF THE HIGHEST RAILWAY IN THE ALPS

ROLLING across a 65-metre-high viaduct in the Alps, the red carriages of the Bernina Express add a splash of colour to the spectacular snow-covered Swiss surroundings .

FLORESCENT PLANKTON LIGHT UP AUSTRALIAN SEA

An Australian beach is illuminated by an enticing neon blue glow as a rare phenomenon lights up the water .

OKLAHOMA TORNADO

Destroyed buildings and overturned cars are seen after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013 .

SLOTH SANCTUARY

SNUGGLING up against their teddy bears, these baby sloths could easily be mistaken for one of the cuddly toys .

RECORD BREAKING WATERMELON

AN American accountant has grown the world's biggest MELON and smashed his way into the record books with his mammoth 350 .

AMAZING AMERICAN LANDSCAPES

This tranquil setting stretches for miles as the sun sets behind the mountain .