Joe Biden speaks at memorial for Boston police officer

US Vice President Joe Biden today spoke at the memorial for Sean Collier, a police officer killed in the search for the Boston marathon suspects.

Biden commended all who attended the memorial, saying that people's determination "resonated around the world".


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.