Whether the stampede was a tragic accident or the result of a deliberate attack may never be known for sure.

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The authorities have taken several days to confirm the blast was an accident rather than a deliberate attack by one of Mexico's armed groups.

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"This was a very sinister, deliberate attack, " he said.

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Whether it's a deliberate attack, as with anthrax, or the outbreak of a slow and silent killer such as HIV, the Centers for Disease Control and Prevention is in the forefront of America's defense.

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There are stern questions, but if you go through the show, there is no deliberate personal attack nor humiliation.

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Although this was a widespread outage, neither the cause nor the recovery time should be used to compare it with a deliberate, well coordinated terrorist attack on the electrical transmission system.

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Secretary Weinberger will also be remembered for the seminal role he played in shifting the national paradigm from one of deliberate vulnerability to ballistic missile attack to one in which anti-missile defenses are part of a comprehensive homeland security posture.

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Passing sentence on Monday, a judge said the fatal attack had been "deliberate and wicked".

BBC: Sean Martin