East Anglia air ambulances have returned to service after helicopter operator Bond Air Services suspended a number of flights over a "defect" in one aircraft.
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The Queen has arrived at Royal Manchester Children's Hospital to meet victims of the suicide bombing at the city's arena.
Bomb disposal units have been sent to a site in Manchester and are responding to an incident.
Across the nation a minute's silence was observed at 11am to remember the victims of the Manchester Arena terror attack.