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
FLYING through the air, these delighted pooches pull their best poses mid-flight .
Peering curiously into a basket hanging off the arms of a snowman, this little squirrel appears fascinated by the snowy figure .
A blanket of fog is lit up by the colourful glowing lights of the city below .
THE THOUGHT OF BECOMING shipwrecked on a remote destination would fill most holidaymakers with dread .
This hungry white tiger has just one thing on her mind - to taste fresh meat .
GIANT garden sculptures don't beat about the bush .
A middle spotted woodpecker swoops into her nest and feeds her young in a forest in Trentino, Italy .
ROLLING around in the snow, these young brown bears take a break from their play fight to share a tender hug with one another .
Exploding out of the water, a great white shark performs a backflip during a hunt for seals .
LIKE A living balloon this baitball of sardines is ready to burst when threatened by a pointy nosed sailfish .
These photographs of extreme weather capture storms furiously rolling across the sky above America .
BASKING in smug satisfaction, a confident squirrel gives a wink to the camera .