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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In an open letter to Jeremy Corbyn, senior Labour figures said Labour needed to present an alternative to the Tories' "destructive Brexit".
Six people have been injured and a man has been arrested after an alleged noxious substance attack in east London.
The US first lady travelled without her husband to support the Invictus Games, which were founded by the Prince in 2014.