A lone officer from the bomb squad was captured on video destroying an unattended backpack left near to the Boston Marathon finish line. A man remains in police custody in connection with the incident.
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Firefighters across California have been battling major wildfires in what could be the most destructive wildfire season on record.
This summer's fundraising juggernaut, the ALS Ice Bucket challenge, has raised almost £7m in the fight against Motor Neurone Disease.
Winning entries from the Astronomy Photographer of the Year 2014 competition have been unveiled.