The plant has had a couple of alarming accidents, including a dramatic cooling tower collapse in August of 2007.

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The nuke has had its share of scary moments, including a cooling tower collapse, and, more recently, discoveries of leaks of the radioactive hydrogen isotope tritium.

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Alon and Blake Vaknin -- eight months pregnant -- watched the first tower collapse from their apartment a block away, then fled with their daughter Maia.

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After the 1968 Ronan Point tower block partial collapse in London, in which four people died, new British Standard Structural Design Codes for concrete were introduced to prevent it happening again.

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In 1924, the locals tore down the owl-haunted, "ivy-mantled" tower, fearing its imminent collapse.

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Brittany Clark's father died in the collapse of the south tower.

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Official reports say: A three-year investigation by the National Institute of Standards and Technology concluded that the building collapsed because of uncontrolled fires, started by the collapse of the nearby North Tower, and which burnt for seven hours.

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But a spokeswoman for the Historic Royal Palaces, which is responsible for the Tower's conservation, said it was not related to the collapse on 14 February.

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The first official inquiry into Tower Seven by the Federal Emergency Management Agency was unable to be definitive about what caused its collapse.

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