A minutes silence followed by the ringing of 26 bells was heard in Newtown, Connecticut, one week after a gunman broke into Sandy Hook Elementary school and shot 20 young children and six of their teachers.
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A one minute silence has been held at the Queen's Garden Party in memory of the 22 people killed and 59 injured in the Manchester attack.
Mancunians have come together in defiance after a suicide bomber killed 22 people at a concert.
Extra armed police will be deployed to Wembley and Twickenham this weekend, police have confirmed.