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Boston bombs 'remote trigger'

US investigators have revealed the two bombs that went off at the Boston Marathon were detonated with the kind of remote control device used for a toy car.

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Police gather for memorial service for fallen colleague

Police officers take their seats for the memorial service for Massachusetts Institute of Technology (MIT) police officer Sean Collier. Credit: Reuters

The Vice President Joe Biden and his wife Jill are among attendees at a memorial service to honour Officer Sean Collier, who was shot and killed on 18th April in the aftermath of the Boston Marathon bombings. Authorities expected around 10,000 people to attend.

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