Boston has observed a moment of silence in honour of those killed and injured in the twin bombings.
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Boston observes moment of silence
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Thousands pay their respects
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Standoff ends peacefully in Centennial
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Hide will remember the ordinary people
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Fall of Singapore prisoners remembered
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Edward Kennedy laid to rest near slain brothers
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Wreaths laid on graves of independence figures
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Bodies of two persons recovered
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Both Houses adjourned after paying tributes
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Two killed in separate incidents
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Bombers 'killed a peacemaker'
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Rhode Island remembers fatal nightclub fire
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'Void left by tragedy will never be filled'
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Three persons killed in separate incidents
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Mourners gather to remember train operator
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Macdill honors those that died serving
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Some Haitians say they feel forgotten