Death and destruction descended on the Boston Marathon yesterday as two blasts rocked the finish line, killing three and injuring more than 100 people.

Horrifying images of injured spectators and blood-splattered pavements were caught as television cameras broadcast footage of the explosions.

Participants were also seen lying on the ground as the impact tore through the finish line, sending smoke and debris soaring into the air.

Emergency workers ripped away fencing as others carried injured men and women from the scene.

In a televised address, US President Barack Obama said those responsible will feel the "full weight of justice".

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