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
COURAGEOUS CLIMBERS scale frozen waterfalls in Canada, as the ice threatens to collapse beneath them .
THROWING himself off 1,100ft bridges in a wheelchair, this is the PARALYSED base jumper who knows no fear .
Pouncing down on top of his twin brother, these two snow leopard cubs practice their kung-fu moves .
A family of foster carers are facing bankruptcy and homelessness after they signed up to a Government scheme to renovate their house to be used for disabled children's short breaks .
Exploding out of the water, a great white shark performs a backflip during a hunt for seals .
FISTS fly as two gorillas take each other on in a dramatic battle .
WITH STUNNING colours and serene scenes, these photographs capture the otherworldly beauty of the English coast .
OFFERING a glimpse into the past, a mash-up of old and new photographs show how the world’s biggest cities have changed .
Armed with a snorkel, flippers and her skimpy bikini, an intrepid female free diver swims alongside an array of reef sharks .
A little brown bear cub shows his doting mum that she is always on parent duty as he uses her as a scratching post .
IN a galaxy not so far away lies a magical display of lights that could be the latest image from NASA .
SWIMMING slowly towards the shore, a small group of bottlenose dolphins arrive for breakfast at a beach in Western Australia .