A spate of recent deaths of New York police and fire officers who took part in the emergency operation at Ground Zero after the 9/11 attacks has heightened fears that it could be the start of a delayed epidemic of cancer-related illness.

Five firefighters and police officers, all of whom were involved in the rescue and clear-up at the site of the collapsed Twin Towers, have died of cancer in the past three months, the oldest being 44. Three died last month within a four-day period.

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