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Explosion

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One year after the Boston Marathon bombing took the lives of 3 people and injured hundreds of others, a wreath laying ceremony was held in remembrance of those who died

One year after the Boston Marathon bombing took the lives of 3 people and injured hundreds of others, a wreath laying ceremony was held in remembrance of those who died. The ceremony was attended by the families of the three bombing victims as well as relatives of a Massachusetts Institute of Technology police officer killed in the blasts' aftermath.

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Three bombs were detonated outside of Cairo University, leaving a police brigadier-general dead, and several others injured. The third bomb exploded as security personnel scoured the site for clues

Three bombs were detonated outside of Cairo University, leaving a police brigadier-general dead, and several others injured. The third bomb exploded as security personnel scoured the site for clues. Egypt has been in a state of unrest since President Mohamed Morsi's ouster last summer. CBS News' Alex Ortiz reports.

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A surveillance camera captured the explosion that brought down two five-story apartment buildings in the Harlem section of New York City. The video shows debris raining down on the street just outside the building.

A surveillance camera captured the explosion that brought down two five-story apartment buildings in the Harlem section of New York City. The video shows debris raining down on the street just outside the building. Investigators suspect a gas leak was the cause. Scott Pelley reports.

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Search crews spent the day digging through still smoldering rubble after an explosion caused the collapse of two buildings in the New York City neighborhood of Harlem. A gas leak was reported 15 minutes before the explosion, but workers arrived too late.

Search crews spent the day digging through still smoldering rubble after an explosion caused the collapse of two buildings in the New York City neighborhood of Harlem. A gas leak was reported 15 minutes before the explosion, but workers arrived too late. Michelle Miller reports.

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