President Obama issues a statement from the briefing room, following deadly twin blasts at the finishing line of the Boston Marathon.
'On days like this there are no Republicans and Democrats, we are Americans united in concern for our fellow American citizens.'
Moment of blast some 100-150 metres from the finishing line.
One of two fatal detonations close to finish line.
As tensions remain high on the Korean peninsula, the South’s military has released a video apparently showing a training exercise at sea.
The video, released on 5 April, describes the scenario as South Korea’s Second Fleet using depth charges to 'sink' a North Korean submarine.
Dominic Lipinski/PA Wire